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Moebus M, Holz C. Personalized interpretable prediction of perceived sleep quality: Models with meaningful cardiovascular and behavioral features. PLoS One 2024; 19:e0305258. [PMID: 38976698 PMCID: PMC11230538 DOI: 10.1371/journal.pone.0305258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 05/28/2024] [Indexed: 07/10/2024] Open
Abstract
Understanding a person's perceived quality of sleep is an important problem, but hard due to its poor definition and high intra- as well as inter-individual variation. In the short term, sleep quality has an established impact on cognitive function during the following day as well as on fatigue. In the long term, good quality sleep is essential for mental and physical health and contributes to quality of life. Despite the need to better understand sleep quality as an early indicator for sleep disorders, perceived sleep quality has been rarely modeled for multiple consecutive days using biosignals. In this paper, we present novel insights on the association of cardiac activity and perceived sleep quality using an interpretable modeling approach utilizing the publicly available intensive-longitudinal study M2Sleep. Our method takes as input signals from commodity wearable devices, including motion and blood volume pulses. Despite processing only simple and clearly interpretable features, we achieve an accuracy of up to 70% with an AUC of 0.76 and reduce the error by up to 36% compared to related work. We further argue that collected biosignals and sleep quality labels should be normalized per-participant to enable a medically insightful analysis. Coupled with explainable models, this allows for the interpretations of effects on perceived sleep quality. Analysis revealed that besides higher skin temperature and sufficient sleep duration, especially higher average heart rate while awake and lower minimal activity of the parasympathetic and sympathetic nervous system while asleep increased the chances of higher sleep quality.
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Affiliation(s)
- Max Moebus
- Department of Computer Science, ETH Zurich, Zürich, Switzerland
| | - Christian Holz
- Department of Computer Science, ETH Zurich, Zürich, Switzerland
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Shorer EF, Rubin LH, French AL, Weber KM, Daubert E, Yohannes T, Morack R, Clish C, Bullock K, Gustafson D, Sharma A, Rogando AC, Qi Q, Burgess HJ, Dastgheyb RM. Tryptophan-kynurenine metabolic pathway and daytime dysfunction in women with HIV. J Neurovirol 2024:10.1007/s13365-024-01195-x. [PMID: 38472641 DOI: 10.1007/s13365-024-01195-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 02/16/2024] [Accepted: 02/20/2024] [Indexed: 03/14/2024]
Abstract
Sleep disturbances are prevalent in women with HIV (WWH). Tryptophan-kynurenine (T-K) pathway metabolites are associated with alterations in actigraphy derived sleep measures in WWH, although may not always correlate with functional impairment. We investigated the relationship between T-K pathway metabolites and self-reported daytime dysfunction in WWH and women without HIV (WWoH). 141 WWH on stable antiretroviral therapy and 140 demographically similar WWoH enrolled in the IDOze Study had targeted plasma T-K metabolites measured using liquid chromatography-tandem mass spectrometry. We utilized the daytime dysfunction component of the Pittsburgh Sleep Quality Index (PSQI) to assess functional impairment across HIV-serostatus. Lower levels of 5-hydroxytryptophan and serotonin were associated with greater daytime dysfunction in all women. In WWH, daytime dysfunction was associated with increased kynurenic acid (R = 0.26, p < 0.05), and kynurenic acid-tryptophan (KA-T) ratio (R = 0.28, p < 0.01). WWH with daytime dysfunction had a 0.7 log fold increase in kynurenic acid compared to WWH without daytime dysfunction. Kynurenic acid levels and the KA-T ratio were associated with daytime dysfunction in WWH but not in WWoH. Longitudinal studies are needed to establish a causal relationship and directionality between T-K metabolic changes and sleep impairment in WWH.
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Affiliation(s)
- Eran Frank Shorer
- Department of Neurology, Johns Hopkins Hospital, Johns Hopkins University School of Medicine, Room 490, Carnegie Building, 600 North Wolfe Street, Baltimore, MD, USA.
| | - Leah H Rubin
- Department of Neurology, Johns Hopkins Hospital, Johns Hopkins University School of Medicine, Room 490, Carnegie Building, 600 North Wolfe Street, Baltimore, MD, USA
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Epidemiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Audrey L French
- Department of Medicine, Stroger Hospital of Cook County, Chicago, IL, USA
| | | | | | | | | | - Clary Clish
- Metabolomics Platform, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA, USA
| | - Kevin Bullock
- Metabolomics Platform, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA, USA
| | - Deborah Gustafson
- Department of Neurology, State University of New York Downstate Medical Center, Brooklyn, NY, USA
| | - Anjali Sharma
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Andrea C Rogando
- Hektoen Institute of Medicine, Chicago, IL, USA
- College of Science and Health at Charles R. Drew University of Medicine and Science, Los Angeles, CA, USA
| | - Qibin Qi
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Helen J Burgess
- Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
| | - Raha M Dastgheyb
- Department of Neurology, Johns Hopkins Hospital, Johns Hopkins University School of Medicine, Room 490, Carnegie Building, 600 North Wolfe Street, Baltimore, MD, USA
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Reid KJ, Ingram LT, Jimenez M, Orban ZS, Abbott SM, Grimaldi D, Knutson KL, Zee PC, Koralnik IJ, Maas MB. Impact of sleep disruption on cognitive function in patients with postacute sequelae of SARS-CoV-2 infection: initial findings from a Neuro-COVID-19 clinic. SLEEP ADVANCES : A JOURNAL OF THE SLEEP RESEARCH SOCIETY 2024; 5:zpae002. [PMID: 38370438 PMCID: PMC10873785 DOI: 10.1093/sleepadvances/zpae002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 12/27/2023] [Indexed: 02/20/2024]
Abstract
Introduction Fatigue, brain fog, and sleep disturbance are among the most common symptoms of postacute sequelae of SARS-CoV-2 infection (PASC). We sought to determine the impact of sleep disruption on cognition and quality of life in patients with neurologic manifestations of PASC (Neuro-PASC). Methods Thirty-nine patients were recruited from Neuro-COVID-19 clinic. Mean age was 48.1 years, 71.8% were female, and 82% were never hospitalized for COVID-19. Patients were evaluated via clinical assessment, quality-of-life measures in domains of cognitive function, fatigue, sleep disturbance, anxiety, and depression, NIH Toolbox cognitive tests, and 7 days of wrist actigraphy. Results The median number of neurologic symptoms attributed to PASC was 6, with brain fog being the most common in 89.7%. Regarding non-neurologic symptoms, 94.9% complained of fatigue and 74.4% of insomnia. Patients reported significant impairment in all quality-of-life domains and performed worse in a task of attention compared to a normative US population. Actigraphy showed Neuro-PASC patients had lower sleep efficiency, longer sleep latency (both p < 0.001), and later sleep midpoint (p = 0.039) compared to 71 age-matched healthy controls with no PASC history. Self-reported cognitive symptoms correlated with the severity of fatigue (p < 0.001), anxiety (p = 0.05), and depression (p < 0.01). Objective evidence of sleep disruption measured by wakefulness after sleep onset, sleep efficiency, and latency were associated with decreased performance in attention and processing speed. Conclusion Prospective studies including larger populations of patients are needed to fully determine the interplay of sleep disruption on the cognitive function and quality of life of patients with PASC.
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Affiliation(s)
- Kathryn J Reid
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Louis T Ingram
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Millenia Jimenez
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Zachary S Orban
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Sabra M Abbott
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Daniela Grimaldi
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Kristen L Knutson
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Phyllis C Zee
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Igor J Koralnik
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Mathew B Maas
- Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Center for Circadian and Sleep Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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Tong X, Gao MM, Zhang L, Song JG, Feng Y, Tao Y, Zhu LJ, Wen LY, Jin YL, Chang WW. Chronotypes and their association with sleep quality among Chinese college students of Anhui Province: a cross-sectional study. BMJ Open 2023; 13:e076782. [PMID: 37984950 PMCID: PMC10660650 DOI: 10.1136/bmjopen-2023-076782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 10/25/2023] [Indexed: 11/22/2023] Open
Abstract
OBJECTIVES To describe the prevalence of chronotype and sleep quality among Chinese college students and explore the relationship between chronotype and sleep quality. DESIGN A cross-sectional study. SETTING Four colleges and universities in Anhui, China, between November and December 2020. PARTICIPANTS A total of 4768 college students were recruited using a stratified, multistage, cluster sampling survey. OUTCOME MEASURES Morningness-Eveningness Questionnaire 19 was used to determine the chronotype of the students and the Pittsburgh Sleep Quality Index (PSQI) was used to measure their sleep quality. The multiple logistic regression model was used to explore the potential association between chronotype and sleep quality. RESULTS The self-reported proportions of evening-type (E-type), neutral-type and morning-type among college students were 51.17%, 45.14% and 3.69%, respectively. The mean PSQI score was 4.97±2.82 and the prevalence of poor sleep quality was 18.2%. After adjusting the covariates by multiple logistic regression analysis, E-type was positively associated with subjective sleep quality (OR=1.671, 95% CI 1.414 to 1.975), sleep latency (OR=1.436, 95% CI 1.252 to 1.647), sleep duration (OR=2.149, 95% CI 1.506 to 3.067), habitual sleep efficiency (OR=1.702, 95% CI 1.329 to 2.180), daytime dysfunction (OR=1.602, 95% CI 1.412 to 1.818) and overall poor sleep quality (OR=1.866, 95% CI 1.586 to 2.196). CONCLUSIONS College students mainly exhibited E-type, and an elevated prevalence of poor sleep quality existed among these students. The E-type was positively associated with poor sleep quality.
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Affiliation(s)
- Xin Tong
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Mei-Mei Gao
- Department of Ideological and Political Education, Anhui Medical College, Hefei, Anhui, China
| | - Liu Zhang
- Department of Hospital Infection Management Office, Wuhu Hospital of Traditional Chinese Medicine, Wuhu, China
| | - Jian-Gen Song
- Department of Nutrition and Food Hygiene,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Ying Feng
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Yujing Tao
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Li-Jun Zhu
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Li-Ying Wen
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Yue-Long Jin
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
| | - Wei-Wei Chang
- Department of Epidemiology and Health statistics,School of Public Health, Wannan Medical College, Wuhu, Anhui, China
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Nowakowska-Domagała K, Juraś-Darowny M, Podlecka M, Lewandowska A, Pietras T, Mokros Ł. Can morning affect protect us from suicide? The mediating role of general mental health in the relationship between chronotype and suicidal behavior among students. J Psychiatr Res 2023; 163:80-85. [PMID: 37207435 DOI: 10.1016/j.jpsychires.2023.05.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 04/07/2023] [Accepted: 05/01/2023] [Indexed: 05/21/2023]
Abstract
Although chronotype has been associated with suicidal behavior, current research suggest that this relationship may be mediated by other factors. The aim of this study was to assess whether chronotype, specifically morningness, may predict suicidal behavior and whether this relationship may be mediated by general mental health, depressive and anxiety symptoms, and/or social functioning among young adults. The study group comprised 306 students: 204 (65.8%) women, 101 (32.6%) men and one who chose not to identify with either option (0.3%). The participants completed The Composite Scale of Morningness, The General Health Questionnaire, 30-item version, Suicide Acceptance Questionnaire and The Suicidal Behaviors Questionnaire-Revised. Correlations between the continuous variables of interest revealed a weak, but significant, negative association between morning affect (CSM) and suicidal behavior (SBQ-R); a moderate positive association was found between suicidal behavior (SBQ-R) and depression/anxiety, and a weak one between suicidal behavior (SBQ-R) and interpersonal relations (GHQ-30). The models predicting suicidal behavior, and chronotype-related variables as predictors of suicidal behavior, were then tested. Although the morning affect predicted suicidal behavior, this effect became irrelevant when combined with mental health characteristics: psychopathological symptoms of depression and anxiety and the quality of interpersonal relations. Our findings imply that the role of chronotype is secondary to general mental health: mental disorder symptoms should be considered as the core risk factors for suicide and serve as the focus for suicide risk assessments.
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Affiliation(s)
- Katarzyna Nowakowska-Domagała
- University of Lodz, Institute of Psychology, Faculty of Educational Sciences, Rodziny Scheiblerów 2, 90-128, Lodz, Poland.
| | - Małgorzata Juraś-Darowny
- University of Lodz, Institute of Psychology, Faculty of Educational Sciences, Rodziny Scheiblerów 2, 90-128, Lodz, Poland.
| | - Marlena Podlecka
- Institute of Psychiatry and Neurology, Department of Neurosis, Personality and Eating Disorders, Sobieskiego 9, 02-957, Warsaw, Poland.
| | - Aleksandra Lewandowska
- J. Babiński Specialist Psychiatric Health Care Team, Psychiatric Ward for Children, Aleksandrowska 159, 02-229, Lodz, Poland.
| | - Tadeusz Pietras
- Institute of Psychiatry and Neurology, Second Department of Psychiatry, Sobieskiego 9, 02-957, Warsaw, Poland.
| | - Łukasz Mokros
- Institute of Psychiatry and Neurology, Second Department of Psychiatry, Sobieskiego 9, 02-957, Warsaw, Poland.
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Choilek S, Karashima A, Motoike I, Katayama N, Kinoshita K, Nakao M. Statistical Modeling of Subjective Sleep Quality. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2023; 2023:1-6. [PMID: 38083152 DOI: 10.1109/embc40787.2023.10340638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Effective maintenance/improvement of sleep quality requires knowledge of how sleep quality is connected to quantitative features of sleep and arbitrarily selected habitual lifestyles, which naturally depend on the demographic characteristics of individuals. To fulfill these needs, a regression model of subjective sleep quality was constructed, whereby one might be able to design a practical strategy for achieving comfortable sleep adapted to individual conditions. Based on data obtained from our previous study, fundamental correlation profiles between day-to-day subjective and quantitative features of sleep were estimated. Obtained correlation profiles involving SRSs, quantitative features of sleep, and sleep habits across a week such as bedtime preference (chronotype), discrepancy between chronotype and social time cue (social jetlag), and habitual sleep-wake pattern (HSWP) were characterized specifically for each self-ratings of sleep quality (SRS) category through backward stepwise Linear Mixed Effect (LME) modeling. The LME model represented SRSs with acceptable accuracy, allowing identification of determinant factors for each category of SRS. The SRS is one possible option to clarify sleep status. In this study, we proposed a possible framework including model-based predictors of SRS in which self-awareness of sleep quality could be improved to facilitate healthy sleep practices.
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Shirota A, Kamimura M, Katagiri A, Taniike M, Kato T. Subjective sleep assessments are correlated with EEG-related sleep measurements of the first sleep cycle in healthy young adults. Sleep Biol Rhythms 2023; 21:211-219. [PMID: 38469279 PMCID: PMC10899956 DOI: 10.1007/s41105-022-00437-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 12/03/2022] [Indexed: 12/23/2022]
Abstract
This study examined whether subjective and objective sleep parameters (sleep stage, electroencephalography [EEG] power, heart rate variability) are related to the progression of sleep cycles using differences in the variables between two nights. We hypothesized that the association between night-to-night differences between subjective and objective sleep variables reflect the difference in objective sleep variables in the first sleep cycle. Seventy-seven healthy adults (23.8 ± 2.2 years; 41 females) participated in polysomnographic recordings on two consecutive nights. To extract the variables that represent the difference between the nights, the sleep parameters of Night 1 were subtracted from those of Night 2. Spearman's rho was used to assess correlations between subjective sleep assessments and objective sleep parameters, with false discovery rate correction for multiple comparisons. Subjective sleep assessments were significantly correlated with whole-night sleep architecture and quantitative EEG activity, but not with heart rate variability during the night. Among sleep cycles, subjective sleep parameters were correlated with the objective sleep parameters in the first sleep cycle ("Ease of falling asleep" vs. waking after sleep onset [r = - 0.382], "Depth of sleep" vs. EEG theta power [r = 0.404], "Quality of sleep" vs. the percentage of stage N3 [r = 0.412] and EEG delta power [r = 0.458], all p < 0.05). These results suggest the importance of taking the difference among the nights into account when assessing subjective sleep quality. This study clarified that sleep in the first sleep cycle has a dominant influence on subjective sleep assessments. Supplementary Information The online version contains supplementary material available at 10.1007/s41105-022-00437-x.
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Affiliation(s)
- Ai Shirota
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Mayo Kamimura
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Ayano Katagiri
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Masako Taniike
- Department of Child Development, United Graduate School of Medicine, Osaka University, Suita, Japan
- Sleep Medicine Center, Osaka University Hospital, Suita, Japan
| | - Takafumi Kato
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
- Sleep Medicine Center, Osaka University Hospital, Suita, Japan
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The effect of caffeine on subsequent sleep: A systematic review and meta-analysis. Sleep Med Rev 2023; 69:101764. [PMID: 36870101 DOI: 10.1016/j.smrv.2023.101764] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 01/22/2023] [Accepted: 01/26/2023] [Indexed: 02/09/2023]
Abstract
The consumption of caffeine in response to insufficient sleep may impair the onset and maintenance of subsequent sleep. This systematic review and meta-analysis investigated the effect of caffeine on the characteristics of night-time sleep, with the intent to identify the time after which caffeine should not be consumed prior to bedtime. A systematic search of the literature was undertaken with 24 studies included in the analysis. Caffeine consumption reduced total sleep time by 45 min and sleep efficiency by 7%, with an increase in sleep onset latency of 9 min and wake after sleep onset of 12 min. Duration (+6.1 min) and proportion (+1.7%) of light sleep (N1) increased with caffeine intake and the duration (-11.4 min) and proportion (-1.4%) of deep sleep (N3 and N4) decreased with caffeine intake. To avoid reductions in total sleep time, coffee (107 mg per 250 mL) should be consumed at least 8.8 h prior to bedtime and a standard serve of pre-workout supplement (217.5 mg) should be consumed at least 13.2 h prior to bedtime. The results of the present study provide evidence-based guidance for the appropriate consumption of caffeine to mitigate the deleterious effects on sleep.
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Saraceni N, Campbell A, Kent P, Ng L, Straker L, O’Sullivan P. An Exploration of the Influence of Non-Biomechanical Factors on Lifting-Related LBP. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:1903. [PMID: 36767270 PMCID: PMC9914774 DOI: 10.3390/ijerph20031903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
Objective: The primary objective was to compare non-biomechanical factors between manual workers with and without a history of LBP related to lifting. A secondary objective was to investigate associations between the change in pain intensity during repeated lifting (termed pain ramp) and non-biomechanical factors tested in the LBP group. Methods: Manual workers currently in lifting occupations with and without a history of lifting-related LBP were recruited (21 LBP and 20 noLBP) and took part in a repeated (100) lift task. A series of non-biomechanical factors, including psychological, work-related, lifestyle, whole health and psychophysical factors, were collected. Psychophysical factors (pressure pain thresholds (PPTs) and fatigue) were also measured at different time points. Associations between pain ramp during lifting and non-biomechanical factors were investigated with linear regression. Results: The LBP group reported worse perceived sleep quality, more musculoskeletal pain sites other than LBP and greater symptoms related to gastrointestinal complaints and pseudo-neurology compared to the group with no history of LBP. The group with LBP were also slightly more worried about the lifting task and felt more fatigued at the end of the lifting task. The feeling of fatigue during lifting was positively associated with pain ramp in the LBP group. Anxiety and gastrointestinal complaints were weakly negatively associated with pain ramp during lifting. Conclusions: The group differences of poorer perceived sleep, greater non-specific health complaints, slightly more worry about the lifting task and more perceived fatigue in the LBP group highlight the complex and multi-factorial nature of LBP related to lifting. The feeling of fatigue was positively associated with pain ramp in the LBP group, suggesting a close relationship with pain and fatigue during lifting that requires further exploration.
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Affiliation(s)
- Nic Saraceni
- Curtin School of Allied Health, Curtin University, Bentley 6845, Western Australia, Australia
| | - Amity Campbell
- Curtin School of Allied Health, Curtin University, Bentley 6845, Western Australia, Australia
| | - Peter Kent
- Curtin School of Allied Health, Curtin University, Bentley 6845, Western Australia, Australia
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark Campusvej 55, 5230 Odense, Denmark
| | - Leo Ng
- Curtin School of Allied Health, Curtin University, Bentley 6845, Western Australia, Australia
| | - Leon Straker
- Curtin School of Allied Health, Curtin University, Bentley 6845, Western Australia, Australia
| | - Peter O’Sullivan
- Curtin School of Allied Health, Curtin University, Bentley 6845, Western Australia, Australia
- Body Logic Physiotherapy, Shenton Park 6008, Western Australia, Australia
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Sethi PP, Pathania M, Gupta R, Sharma P, Saini LK. Poor quality sleep is associated with greater carotid intima media thickness among otherwise healthy resident doctors. FRONTIERS IN EPIDEMIOLOGY 2023; 2:1044111. [PMID: 38455319 PMCID: PMC10910945 DOI: 10.3389/fepid.2022.1044111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/13/2022] [Indexed: 03/09/2024]
Abstract
Background Sleep is important for maintaining the metabolic processes in the body, and hence, disruption in sleep leads to metabolic derangement and accelerated atherosclerosis. The effect of sleep duration on subclinical atherosclerosis has been examined in several studies; however, data regarding sleep quality is lacking. The study aimed to assess the association between sleep quality and carotid intima-media thickness among healthy young doctors. Materials and Methods This was an observational cross-sectional study among 110 healthy young resident doctors. Anthropometric data were recorded and morning fasting venous blood samples were collected to assess fasting blood sugar, lipid profile and glycosylated haemoglobin (HbA1c). Pittsburgh Sleep Quality Index and Berlin questionnaire assessed subjective sleep quality and risk for obstructive sleep apnea, respectively. Carotid ultrasonography was done to detect the intima-media thickness. Results Average age of the participants was 26.45 (±1.43) years, and 51.8% were male. Self-reported poor sleep quality was found in 54.5%. Carotid intima-media thickness (CIMT) was increased among 44.5% of participants. In the multivariate analysis, only poor sleep quality appeared to be associated with higher CIMT (P < 0.001, OR = 7.4; 95% CI = 2.70-20.32). When different components of sleep quality was analyzed through multivariate logistic regression, subjective sleep onset latency (>30 min), sleep efficiency (<85%) and sleep disturbance was found to be associated with the increased CIMT. Conclusion Poor sleep quality, especially prolonged sleep onset latency, poor sleep efficiency, and sleep disturbance are associated with increased carotid intima-media thickness among healthy young adults.
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Affiliation(s)
| | - Monika Pathania
- Department of Internal Medicine, All India Institute of Medical Science, Rishikesh, India
| | - Ravi Gupta
- Department of Psychiatry, All India Institute of Medical Science, Rishikesh, India
| | - Pankaj Sharma
- Department of Radiodiagnosis, All India Institute of Medical Science, Rishikesh, India
| | - Lokesh Kumar Saini
- Department of Pulmonary Medicine, All India Institute of Medical Science, Rishikesh, India
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Jabakhanji SB, Lepinteur A, Menta G, Piper A, Vögele C. Sleep quality and the evolution of the COVID-19 pandemic in five European countries. PLoS One 2022; 17:e0278971. [PMID: 36576928 PMCID: PMC9797060 DOI: 10.1371/journal.pone.0278971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 11/28/2022] [Indexed: 12/29/2022] Open
Abstract
The COVID-19 pandemic has led to lifestyle changes across Europe with a likely impact on sleep quality. This investigation considers sleep quality in relation to the evolution of the COVID-19 pandemic in five European countries. Using panel regressions and keeping policy responses to COVID-19 constant, we show that an increase in the four-week average daily COVID-19 deaths/100,000 inhabitants (our proxy for the evolution of the pandemic) significantly reduced sleep quality in France, Germany, Italy, Spain, and Sweden between April 2020 and June 2021. Our results are robust to a battery of sensitivity tests and are larger for women, parents and young adults. Additionally, we show that about half of the reduction in sleep quality caused by the evolution of the pandemic can be attributed to changes in lifestyles, worsened mental health and negative attitudes toward COVID-19 and its management (lower degree of confidence in government, greater fear of being infected). In contrast, changes in one's own infection-status from the SARS-CoV-2 virus or sleep duration are not significant mediators of the relationship between COVID-19-related deaths and sleep quality.
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Affiliation(s)
- Samira Barbara Jabakhanji
- Healthcare Outcomes Research Centre, RCSI University of Medicine and Health Sciences, Dublin, Ireland
- Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | | | - Giorgia Menta
- Luxembourg Institute of Socio-Economic Research (LISER), Esch-sur-Alzette, Luxembourg
| | - Alan Piper
- University of Leeds, Leeds, United Kingdom
| | - Claus Vögele
- University of Luxembourg, Esch-sur-Alzette, Luxembourg
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12
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Zhu Y, Huang J, Yang M. Association between Chronotype and Sleep Quality among Chinese College Students: The Role of Bedtime Procrastination and Sleep Hygiene Awareness. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:ijerph20010197. [PMID: 36612519 PMCID: PMC9820042 DOI: 10.3390/ijerph20010197] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/19/2022] [Accepted: 12/20/2022] [Indexed: 05/31/2023]
Abstract
Chronotype and sleep quality have been shown to play significant roles in influencing people's physical and mental health. The current study focuses on examining the relationship between chronotype and sleep quality among Chinese college students and exploring the mediating role of bedtime procrastination and the moderating role of sleep hygiene awareness. A sample of 2822 college students (female = 71.4%) aged between 17 and 29 years (M = 19.77, SD = 1.41) were included and completed the measures of the Pittsburgh Sleep Quality Index (PSQI), Morningness-Eveningness Questionnaire (MEQ), Bedtime Procrastination Scale (BPS) and Sleep Hygiene Awareness Scale (SHAS). The results showed that evening-type students reported the lowest sleep quality and highest levels of bedtime procrastination. In contrast, the highest sleep quality and lowest levels of bedtime procrastination were shown by morning-type, exhibiting the neither-type students' intermediate chronotype. Bedtime procrastination partially mediated the relationship between chronotype and sleep quality. Furthermore, sleep hygiene awareness moderated the direct effect of chronotype on sleep quality and the effect of chronotype in the path from chronotype to bedtime procrastination. Specifically, higher levels of sleep hygiene awareness could buffer the adverse effect of chronotype on self-reported sleep quality but bolstered the negative effect of chronotype on bedtime procrastination. Our results suggest that individuals with an evening preference are inclined to postpone their bedtime and further experience poorer sleep quality at night. Sleep hygiene awareness may serve as a protective factor for poor nocturnal sleep. Overall, the findings highlight the importance of reducing bedtime procrastination and improving sleep hygiene awareness in the interventions designed to help college students to own a better sleep quality, especially for those with evening chronotypes.
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Affiliation(s)
- Yingying Zhu
- Key Research Base of Humanities and Social Sciences of the Ministry of Education, Academy of Psychology and Behavior, Tianjin Normal University, Tianjin 300387, China
- Faculty of Psychology, Tianjin Normal University, Tianjin 300387, China
- Tianjin Social Science Laboratory of Students’ Mental Development and Learning, Tianjin 300387, China
| | - Jiahao Huang
- Faculty of Psychology, Tianjin Normal University, Tianjin 300387, China
| | - Minqi Yang
- School of Education, Zhengzhou University, Zhengzhou 450001, China
- School of Marxism, Zhengzhou University, Zhengzhou 450001, China
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13
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Nowakowska-Domagała K, Juraś-Darowny M, Pietras T, Stecz P, Mokros Ł. Chronotype and poor sleep quality in young adults - a pilot study on the role of rumination. Sleep Med 2022; 100:206-211. [PMID: 36115139 DOI: 10.1016/j.sleep.2022.08.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 08/12/2022] [Accepted: 08/18/2022] [Indexed: 01/12/2023]
Abstract
BACKGROUND Eveningness has been associated with poor sleep quality and depression. However, chronotype has also been shown to be a multidimensional construct, not limited to a merely morningness-eveningness orientation. It has also been proposed that other factors may also mediate the relationship between chronotype and its mental health sequelae. This pilot study explores the role of rumination as a mediator between chronotype and sleep quality, chronotype and depressive symptoms. METHODS A sample of 144 participants completed The Morningness-Eveningness-Stability-Scale Improved (MESSi), Pittsburgh Sleep Quality Index (PSQI), Rumination-Reflection Questionnaire (RRQ) and Center for Epidemiologic Studies Depression Scale (CES-D)). The results were tested using Spearman's rank correlation coefficient, multiple linear regression and the Sobel test. RESULTS Rumination was linked to poor sleep quality and increased depression. Morning affect and Distinctness (i.e. rigidity, or the subjective amplitude of the circadian rhythm) correlated with rumination. Rumination was a partial mediator of the associations between Morning Affect and sleep quality, Morning Affect and depression. CONCLUSIONS Rumination may play a role in the association between chronotype (particularly Morning Affect and Distinction) and sleep quality and depression. The recognition of this association might serve as a basis for clinical psychoeducational and therapeutic programs targeting both adjustment of the circadian rhythm and rumination as a psychopathological sign.
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Affiliation(s)
| | | | - Tadeusz Pietras
- II-nd Psychiatry Clinic, Institute of Psychiatry and Neurology, Warsaw, Poland
| | - Patryk Stecz
- Institute of Psychology, Faculty of Educational Sciences, University of Lodz, Lodz, Poland
| | - Łukasz Mokros
- Department of Clinical Pharmacology, Medical University of Lodz, Lodz, Poland
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14
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Mochón-Benguigui S, Carneiro-Barrera A, Dote-Montero M, Castillo MJ, Amaro-Gahete FJ. Sleep and Anabolic/Catabolic Hormonal Profile in Sedentary Middle-Aged Adults: The FIT-AGEING Study. Int J Mol Sci 2022; 23:ijms232314709. [PMID: 36499035 PMCID: PMC9739476 DOI: 10.3390/ijms232314709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/22/2022] [Accepted: 11/23/2022] [Indexed: 11/27/2022] Open
Abstract
Sleep quality plays an important role in the modulation of several aging markers. This influence could be explained by aging-induced hormonal changes. Indeed, poor sleep quality has been associated with the development of several endocrine-related health complications. This study examined the relationship of both subjective and objective sleep quantity and quality, with basal levels of selected plasma anabolic and catabolic hormones in sedentary middle-aged adults. A total of 74 volunteers (52.7% women; aged 53.7 ± 5.1) were recruited for this study. Subjective sleep quality was assessed by the Pittsburgh Sleep Quality Index (PSQI; higher scores indicate worse sleep quality), and objective sleep quality parameters (total sleep time [TST], wake after sleep onset [WASO], and sleep efficiency [SE]) were measured using a wrist-worn accelerometer. Basal levels of plasma dehydroepiandrosterone sulphate (DHEAS), total testosterone, sex hormone binding globulin (SHBG), somatotropin, and cortisol levels, were determined. Free testosterone was calculated from the total testosterone and SHBG levels. No associations of global PSQI score, TST, WASO, and SE with DHEAS, free testosterone, and somatotropin plasma levels were found, neither in men nor in women (all p ≥ 0.05). Global PSQI score was inversely related to cortisol plasma levels in women (p = 0.043). WASO was positively associated with cortisol plasma levels, while SE was negatively associated with cortisol plasma levels in women (all p ≤ 0.027). Sleep quality is not related to levels of plasma anabolic hormones, but to levels of catabolic hormones, in sedentary middle-aged adults. Therefore, these results suggest that potential changes in aging biomarkers associated with sleep disturbances, could be mediated by age-related changes in the catabolic endocrine system.
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Affiliation(s)
- Sol Mochón-Benguigui
- EFFECTS-262 Research Group, Department of Medical Physiology, School of Medicine, University of Granada, 18016 Granada, Spain
| | - Almudena Carneiro-Barrera
- Department of Psychology, Universidad Loyola Andalucía, 41704 Seville, Spain
- Sleep and Health Promotion Laboratory, Mind, Brain and Behavior Research Centre, University of Granada, 18011 Granada, Spain
- PROmoting FITness and Health through Physical Activity Research Group (PROFITH), Sport and Health University Research Institute (iMUDS), Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, 18071 Granada, Spain
| | - Manuel Dote-Montero
- EFFECTS-262 Research Group, Department of Medical Physiology, School of Medicine, University of Granada, 18016 Granada, Spain
- PROmoting FITness and Health through Physical Activity Research Group (PROFITH), Sport and Health University Research Institute (iMUDS), Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, 18071 Granada, Spain
| | - Manuel J. Castillo
- EFFECTS-262 Research Group, Department of Medical Physiology, School of Medicine, University of Granada, 18016 Granada, Spain
| | - Francisco J. Amaro-Gahete
- EFFECTS-262 Research Group, Department of Medical Physiology, School of Medicine, University of Granada, 18016 Granada, Spain
- PROmoting FITness and Health through Physical Activity Research Group (PROFITH), Sport and Health University Research Institute (iMUDS), Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, 18071 Granada, Spain
- Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence:
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15
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Philippens N, Janssen E, Kremers S, Crutzen R. Determinants of natural adult sleep: An umbrella review. PLoS One 2022; 17:e0277323. [PMID: 36342936 PMCID: PMC9639822 DOI: 10.1371/journal.pone.0277323] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 10/25/2022] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Sleep has a major impact on health, which makes it a relevant topic for research and health practitioners. Research on sleep determinants, i.e. factors that positively or negatively influence sleep, is fragmented. OBJECTIVE The purpose of this umbrella review is to provide an overview of the current evidence on determinants of natural adult sleep. METHODS A comprehensive literature search was performed on determinants of sleep. Reviews and meta-analyses on natural adult sleep were included. Six electronic databases (PubMed, WoS, Embase, CINAHL, PsycInfo and Cochrane) were used for the search, last accessed September 2021. The quality of the selected articles was assessed using the AMSTAR2 tool. Results were categorized in four main categories: biological, behavioral, environmental and personal/socio-economical determinants. RESULTS In total 93 reviews and meta-analyses resulted in a total of 30 identified determinants. The impact of each determinant differs per individual and per situation. Each determinant was found to affect different sleep parameters and the relationship with sleep is influenced by both generic and specific moderators. DISCUSSION A comprehensive overview on relevant sleep determinants provides a practical and scientifically based starting point to identify relevant intervention approaches to secure or improve individual sleep quality. The difference in aggregation level of the determinants and in measurement methods are the major limitations of this umbrella review. Extending existing generic sleep hygiene rules with an overview of all types of potential determinants will enhance the awareness of the complexity and can be used to improve the effect of sleep interventions in health promotion. TRIAL REGISTRATION The umbrella review was registered with PROSPERO (registration ID CRD42020149648) https://www.google.com/search?client=firefox-b-d&q=CRD42020149648.
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Affiliation(s)
- Nicole Philippens
- Department of Health Promotion, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
- * E-mail:
| | - Ester Janssen
- Department of Health Promotion, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Stef Kremers
- Department of Health Promotion, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Rik Crutzen
- Department of Health Promotion, CAPHRI, Care & Public Health Research Institute, Maastricht University, Maastricht, The Netherlands
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16
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McCarter SJ, Hagen PT, St Louis EK, Rieck TM, Haider CR, Holmes DR, Morgenthaler TI. Physiological markers of sleep quality: A scoping review. Sleep Med Rev 2022; 64:101657. [PMID: 35753151 DOI: 10.1016/j.smrv.2022.101657] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 05/16/2022] [Accepted: 05/29/2022] [Indexed: 10/18/2022]
Abstract
Understanding the associations between adequate sleep, performance and health outcomes is vital, yet a major limitation in the design and interpretation of studies of sleep and performance is the variability of subjective and objective markers used to assess sleep quality. The aim of this scoping review is to investigate how various physiological signals recorded during sleep or wakefulness relate to objective measures of cognitive or physical performance and subjectively perceived sleep quality to inform conceptual understanding of the elusive, amorphous, and multi-dimensional construct of sleep quality. We also aimed to suggest priorities for future areas of research in sleep quality and performance. We searched six databases ultimately yielding 439 studies after duplicate removal. Sixty-five studies were selected for full review. In general, correlations between objectively measured sleep and objective performance or subjectively assessed sleep quality were weak to moderate. Slow wave sleep was moderately correlated with better performance on tasks of vigilance, motor speed, and executive function as well as better subjective sleep quality and feeling well-rested, suggesting that slow wave sleep may be important for sleep quality and optimal daytime performance. However, these findings were inconsistent across studies. Increased sleep fragmentation was associated with poorer subjective sleep quality in both polysomnographic and actigraphic studies. Studies which simultaneously assessed physiologic sleep measures, performance measures and subjective sleep perception were few, limiting the ability to evaluate correlations between subjective and objective outcomes concurrently in the same individuals. Factors influencing the relationship between sleep quality and performance include circadian variability, sleep inertia, and mismatch between sleep stages studied and outcome measures of choice. Ultimately, the determination of "quality sleep" remains largely subjective and inconsistently quantifiable by current measures. Methods evaluating sleep as a continuous measure rather than traditional sleep stages may provide an intriguing approach to future studies of sleep and performance. Future well-designed studies using novel measures of sleep or multimodal ambulatory wearables assessing the three domains of sleep and performance (objective sleep physiology, objective performance, and subjective sleep quality) are needed to better define quality sleep.
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Affiliation(s)
- Stuart J McCarter
- Center for Sleep Medicine, Mayo Clinic and Foundation, Rochester, MN, USA; Department of Neurology, Mayo Clinic and Foundation, Rochester, MN, USA.
| | - Philip T Hagen
- Department of Internal Medicine, Mayo Clinic and Foundation, Rochester, MN, USA
| | - Erik K St Louis
- Center for Sleep Medicine, Mayo Clinic and Foundation, Rochester, MN, USA; Department of Neurology, Mayo Clinic and Foundation, Rochester, MN, USA; Department of Internal Medicine, Mayo Clinic and Foundation, Rochester, MN, USA
| | - Thomas M Rieck
- Mayo Clinic Healthy Living Program, Mayo Clinic and Foundation, Rochester, MN, USA
| | - Clifton R Haider
- Section of Biostatistics, Mayo Clinic and Foundation, Rochester, MN, USA
| | - David R Holmes
- Section of Biostatistics, Mayo Clinic and Foundation, Rochester, MN, USA
| | - Timothy I Morgenthaler
- Center for Sleep Medicine, Mayo Clinic and Foundation, Rochester, MN, USA; Department of Internal Medicine, Mayo Clinic and Foundation, Rochester, MN, USA; Department of Pulmonology, Mayo Clinic and Foundation, Rochester, MN, USA
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17
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Yoon G, Lee MH, Oh SM, Choi JW, Yoon SY, Lee YJ. Negative and positive sleep state misperception in patients with insomnia: factors associated with sleep perception. J Clin Sleep Med 2022; 18:1789-1795. [PMID: 35383568 DOI: 10.5664/jcsm.9974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES In the present study, factors associated with sleep perception were identified by comparing clinical characteristics and polysomnographic variables between insomnia patients with negative and positive sleep state misperception (NSSM and PSSM, respectively). METHODS Subjective and objective sleep measures were retrospectively collected, including the Pittsburgh Sleep Quality Index (PSQI), Beck Depression Inventory (BDI), and a questionnaire on "morning feeling" after nocturnal polysomnography (PSG) in 150 patients with insomnia. Based on the misperception index (MI), participants were classified into NSSM (MI > 0, n = 115) and PSSM (MI < 0, n = 35) groups. RESULTS The PSSM group had more N3 sleep on nocturnal PSG than the NSSM group (p=0.002). The NSSM group showed a higher PSQI score (p<0.001), longer subjective sleep onset latency (SOL) (p=0.001), and a greater SOL discrepancy (p=0.001). Subjective feelings of tiredness and morning awakenings in the morning were higher in the NSSM group (p=0.029 and p=0.038). The MI negatively correlated with a proportion of N3 sleep (p=0.005) and positively correlated with PSQI (p<0.001), morning awakenings (p=0.01), subjective SOL (p<0.001), and SOL discrepancy (p<0.001) in insomnia patients. Multiple regression analysis showed that N3 sleep, PSQI, and morning awakenings were significantly associated with MI in insomnia patients. CONCLUSIONS The proportion of slow-wave sleep and subjective measures may be associated with perception of sleep in insomnia patients. Objective and subjective characteristics of insomnia patients should be carefully evaluated and managed because they may influence the perception of sleep.
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Affiliation(s)
- Gahui Yoon
- Department of Psychiatry and Center for Sleep and Chronobiology, Seoul National University, College of Medicine and Hospital, Seoul, Republic of Korea
| | - Mi Hyun Lee
- Department of Psychiatry and Center for Sleep and Chronobiology, Seoul National University, College of Medicine and Hospital, Seoul, Republic of Korea
| | - Seong Min Oh
- Department of Psychiatry, Dongguk University Ilsan Hospital, Ilsan, Republic of Korea
| | - Jae-Won Choi
- Department of Neuropsychiatry, Eulji University School of Medicine, Eulji General Hospital, Seoul, Republic of Korea
| | - So Young Yoon
- Department of Psychiatry and Center for Sleep and Chronobiology, Seoul National University, College of Medicine and Hospital, Seoul, Republic of Korea
| | - Yu Jin Lee
- Department of Psychiatry and Center for Sleep and Chronobiology, Seoul National University, College of Medicine and Hospital, Seoul, Republic of Korea
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18
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Cudney LE, Frey BN, McCabe RE, Green SM. Investigating the relationship between objective measures of sleep and self-report sleep quality in healthy adults: a review. J Clin Sleep Med 2022; 18:927-936. [PMID: 34609276 PMCID: PMC8883085 DOI: 10.5664/jcsm.9708] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Sleep is one of the most common factors related to health, yet a standard definition of sleep quality has not been identified. Polysomnography provides important information about objective sleep variables. However, the relationship between objective sleep variables and perception of sleep quality remains unclear. The purpose of this review was to (1) summarize the current methods of measuring objective sleep macrostructure and microstructure, including electroencephalography arousals, spectral frequency, cyclic alternating pattern, and self-report sleep quality, and (2) investigate the relationship between objective measures of sleep physiology and self-report sleep quality in healthy adults. METHODS A literature search was conducted using Medline, PubMed, and PsycInfo databases and cited reference searches. Eligible studies included a comparison between self-report sleep quality and polysomnography sleep measures in healthy adults. RESULTS Thirteen studies were identified. Measurement of self-report sleep quality varied widely across studies. Total sleep time and sleep efficiency were most consistently related to sleep quality, while other objective sleep variables, including electroencephalography spectral analysis, were not reliably predictive of self-report sleep quality in healthy adults. There is preliminary support that microstructural sleep analysis with cyclic alternating pattern may be related to self-reported sleep quality. CONCLUSIONS Further research is needed to define and standardize self-report measures of sleep quality and investigate the microstructure of sleep. Objective measures of sleep and experiences of "quality" sleep are not as closely related as one may expect in healthy individuals, and understanding this relationship further is necessary to improve the clinical utility of sleep physiology. CITATION Cudney LE, Frey BN, McCabe RE, Green SM. Investigating the relationship between objective measures of sleep and self-report sleep quality in healthy adults: a review. J Clin Sleep Med. 2022;18(3):927-936.
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Affiliation(s)
- Lauren E. Cudney
- Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, Ontario, Canada,Women’s Health Concerns Clinic, The Research Institute of St. Joe’s Hamilton, Hamilton, Ontario, Canada,Address correspondence to: Lauren E. Cudney, MSc, St. Joseph’s Healthcare Hamilton, Women’s Health Concerns Clinic, 100 West 5th St., Hamilton, ON, Canada, L8N 3K7; Tel: (905) 522-1155 ext. 33672;
| | - Benicio N. Frey
- Women’s Health Concerns Clinic, The Research Institute of St. Joe’s Hamilton, Hamilton, Ontario, Canada,Department of Psychiatry & Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada
| | - Randi E. McCabe
- Department of Psychiatry & Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada,Mental Health and Addictions Program, The Research Institute of St. Joe’s Hamilton, Hamilton, Ontario, Canada
| | - Sheryl M. Green
- Women’s Health Concerns Clinic, The Research Institute of St. Joe’s Hamilton, Hamilton, Ontario, Canada,Department of Psychiatry & Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada
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19
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Blok E, Koopman-Verhoeff ME, Dickstein DP, Saletin J, Luik AI, Rijlaarsdam J, Hillegers M, Kocevska D, White T, Tiemeier H. Sleep and mental health in childhood: a multi-method study in the general pediatric population. Child Adolesc Psychiatry Ment Health 2022; 16:11. [PMID: 35177100 PMCID: PMC8851725 DOI: 10.1186/s13034-022-00447-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 01/31/2022] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Sleep problems, altered sleep patterns and mental health difficulties often co-occur in the pediatric population. Different assessment methods for sleep exist, however, many studies only use one measure of sleep or focus on one specific mental health problem. In this population-based study, we assessed different aspects of sleep and mother-reported mental health to provide a broad overview of the associations between reported and actigraphic sleep characteristics and mental health. METHODS This cross-sectional study included 788 children 10-11-year-old children (52.5% girls) and 344 13-14-year-old children (55.2% girls). Mothers and children reported on the sleep of the child and wrist actigraphy was used to assess the child's sleep patterns and 24 h activity rhythm. Mental health was assessed via mother-report and covered internalizing, externalizing and a combined phenotype of internalizing and externalizing symptoms, the dysregulation profile. RESULTS Higher reported sleep problems were related to more symptoms of mental health problems in 10-11- and 13-14-year-old adolescents, with standardized ß-estimates ranging between 0.11 and 0.35. There was no association between actigraphy-estimated sleep and most mental health problems, but earlier sleep onset was associated with more internalizing problems (ß = - 0.09, SE = 0.03, p-value = 0.002), and higher intra-daily variability of the 24 h activity rhythm was associated with more dysregulation profile symptoms at age 10-11 (ß = 0.11, SE = 0.04, p-value = 0.002). DISCUSSION Reported sleep problems across informants were related to all domains of mental health problems, providing evidence that sleep can be an important topic to discuss for clinicians seeing children with mental health problems. Actigraphy-estimated sleep characteristics were not associated with most mental health problems. The discrepancy between reported and actigraphic sleep measures strengthens the idea that these two measures tap into distinct constructs of sleep.
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Affiliation(s)
- Elisabet Blok
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands ,grid.5645.2000000040459992XThe Generation R Study Group, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - M. Elisabeth Koopman-Verhoeff
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands ,grid.5645.2000000040459992XThe Generation R Study Group, Erasmus MC, University Medical Center, Rotterdam, The Netherlands ,grid.5132.50000 0001 2312 1970Institute of Education and Child Studies, Leiden University, Leiden, The Netherlands ,grid.281318.10000 0004 0443 4869Emma Pendleton Bradley Hospital, East Providence, RI USA
| | - Daniel P. Dickstein
- grid.38142.3c000000041936754XPediMIND Program, McLean Hospital, Harvard Medical School, Boston, MA USA ,grid.38142.3c000000041936754XSimches Center of Excellence in Child and Adolescent Psychiatry, McLean Hospital, Harvard Medical School, Boston, MA USA
| | - Jared Saletin
- grid.281318.10000 0004 0443 4869Emma Pendleton Bradley Hospital, East Providence, RI USA ,grid.40263.330000 0004 1936 9094Department of Psychiatry and Human Behavior, Alpert Medical School of Brown University, Providence, RI USA
| | - Annemarie I. Luik
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands ,grid.5645.2000000040459992XDepartment of Epidemiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Jolien Rijlaarsdam
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands
| | - Manon Hillegers
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands
| | - Desana Kocevska
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands ,grid.5645.2000000040459992XThe Generation R Study Group, Erasmus MC, University Medical Center, Rotterdam, The Netherlands ,grid.5645.2000000040459992XDepartment of Epidemiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands ,grid.419918.c0000 0001 2171 8263Department of Sleep and Cognition, Netherlands Institute for Neuroscience, An Institute of the Royal Netherlands Society for Arts and Sciences, Amsterdam, The Netherlands
| | - Tonya White
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands ,grid.5645.2000000040459992XDepartment of Radiology and Nuclear Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Henning Tiemeier
- grid.416135.40000 0004 0649 0805Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC-Sophia Children’s Hospital, University Medical Center, Rotterdam, The Netherlands ,grid.38142.3c000000041936754XDepartment of Social and Behavioral Science, Harvard T.H. Chan School of Public Health, Boston, MA USA
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20
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Yue T, Liu X, Gao Q, Wang Y. Different Intensities of Evening Exercise on Sleep in Healthy Adults: A Systematic Review and Network Meta-Analysis. Nat Sci Sleep 2022; 14:2157-2177. [PMID: 36540196 PMCID: PMC9760070 DOI: 10.2147/nss.s388863] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 11/24/2022] [Indexed: 12/15/2022] Open
Abstract
The effects of different intensities of evening exercise on subsequent sleep remain contradictory. Thus, this systematic review and network meta-analysis aimed to compare and rank the effects of different intensities of acute evening exercise on sleep in healthy adults with good sleep. Articles were systematically searched journals indexed in the PubMed, Web of Science, Cochrane Library, Embase, and Scopus databases from inception to the 5th of May, 2022. The basic search terms included exercise, sleep and timing, which were combined with AND. Of the 12,203 retrieved, twenty-eight studies with 325 participants met the inclusion criteria. Results revealed that there were no significant differences in terms of impacts on sleep caused by different intensities of acute evening exercise, except that when compared to no exercise, acute evening high-intensity exercise decreased rapid eye movement sleep (mean difference [MD] = -1.95%, 95% credible interval [CI] = -3.58 to -0.35). Compared to no exercise, acute evening moderate-intensity exercise was ranked as the most potential method to improve sleep, displaying a trend to improve wake time after sleep onset (MD = -2.50 min, 95% CI = -8.17 to 1.62), sleep efficiency (MD = +0.41%, 95% CI = -0.71 to 1.66), the proportion of stage N1 (MD = -0.72%, 95% CI = -2.08 to 0.71) and N3 sleep (slow-wave sleep) (MD = +0.84%, 95% CI = -1.17 to 2.78). Acute evening low-intensity exercise displayed the greatest tendency to shorten sleep onset latency (MD = -1.02 min, 95% CI = -4.39 to 2.50) compared to no exercise. Overall, regardless of intensity, acute evening exercise completed before bedtime does not disrupt subsequent sleep in healthy young and middle-aged adults.
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Affiliation(s)
- Tian Yue
- School of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing, People's Republic of China
| | - Xuefang Liu
- School of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing, People's Republic of China
| | - Qi Gao
- School of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing, People's Republic of China
| | - Yan Wang
- School of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing, People's Republic of China
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21
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Amdisen L, Daugaard S, Vestergaard JM, Vested A, Bonde JP, Vistisen HT, Christoffersen J, Garde AH, Hansen ÅM, Markvart J, Schlünssen V, Kolstad HA. A longitudinal study of morning, evening, and night light intensities and nocturnal sleep quality in a working population. Chronobiol Int 2021; 39:579-589. [PMID: 34903140 DOI: 10.1080/07420528.2021.2010741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
We aimed to investigate whether higher light intensity in the morning is associated with better nocturnal sleep quality and whether higher light intensities in the evening or night have the opposite effect. Light intensity was recorded for 7 consecutive days across the year among 317 indoor and outdoor daytime workers in Denmark (55-56° N) equipped with a personal light recorder. Participants reported sleep quality after each nocturnal sleep. Sleep quality was measured using three parameters; disturbed sleep index, awakening index, and sleep onset latency. Associations between increasing light intensities and sleep quality were analyzed using mixed effects models with participant identity as a random effect. Overall, neither white nor blue light intensities during morning, evening, or night were associated with sleep quality, awakening, or sleep onset latency of the subsequent nocturnal sleep. However, secondary analyses suggested that artificial light during the morning and day contrary to solar light may increase vulnerability to evening light exposure. Altogether, we were not able to confirm that higher morning light intensity significantly improves self-reported sleep quality or that higher evening or night light intensities impair self-reported sleep quality at exposure levels encountered during daily life in a working population in Denmark. This suggests that light intensities alone are not important for sleep quality to a degree that it is distinguishable from other important parameters in daily life settings.
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Affiliation(s)
- Lau Amdisen
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Stine Daugaard
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Jesper Medom Vestergaard
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark.,Department of Occupational Medicine, Danish Ramazzini Centre, University Research Clinic, Herning, Denmark
| | - Anne Vested
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Jens Peter Bonde
- Department of Occupational and Environmental Medicine, Bispebjerg and Frederiksberg Hospital, Copenhagen, Denmark.,Department of Public Health, Section of Social Medicine, Institute of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Helene Tilma Vistisen
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Jens Christoffersen
- Knowledge Centre for Daylight, Energy and Indoor Climate, Velux A/s, Velux Group, Hørsholm, Denmark
| | - Anne Helene Garde
- Danish Ministry of Employment, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Åse Marie Hansen
- Department of Public Health, Section of Social Medicine, Institute of Public Health, University of Copenhagen, Copenhagen, Denmark.,Danish Ministry of Employment, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Jakob Markvart
- Department of the Built Environment, Division of Energy Efficiency, Indoor Climate and Sustainability of Buildings, Aalborg University, Copenhagen, Denmark
| | - Vivi Schlünssen
- Department of Public Health, Environment, Occupation and Health, Danish Ramazzini Centre, Aarhus University, Aarhus, Denmark
| | - Henrik Albert Kolstad
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
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22
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Ogeil RP, Nguyen M, Savic M, Lubman DI. Assembling a ‘good’ and ‘bad’ night's sleep: A multifactorial proposition. LIFESTYLE MEDICINE 2021. [DOI: 10.1002/lim2.48] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Rowan P. Ogeil
- Turning Point Eastern Health Richmond Victoria Australia
- Eastern Health Clinical School and Monash Addiction Research Centre Monash University Clayton Victoria Australia
| | | | - Michael Savic
- Turning Point Eastern Health Richmond Victoria Australia
- Eastern Health Clinical School and Monash Addiction Research Centre Monash University Clayton Victoria Australia
| | - Dan I. Lubman
- Turning Point Eastern Health Richmond Victoria Australia
- Eastern Health Clinical School and Monash Addiction Research Centre Monash University Clayton Victoria Australia
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23
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Akutay S, Yilmaz M. The relationship between pain severity and sleep quality: Posttube thoracostomy. Nurs Forum 2021; 56:860-868. [PMID: 34263967 DOI: 10.1111/nuf.12630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 06/18/2021] [Accepted: 06/19/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND The presence of a chest tube is a factor significantly associated with pain and pain posttube thoracostomy that negatively affects sleep quality (SQ). AIM To determine the relationship between the pain severity and SQ of patients who underwent the tube thoracostomy (TT). METHODS This was a descriptive and cross-sectional survey conducted from May 1, 2018, to December 30, 2018, in the thoracic surgery department of Sivas Cumhuriyet University Hospital in Central Anatolia/Turkey. Data were collected using a questionnaire form, a Numerical Rating Scale to determine pain severity, and the Richard-Campbell Sleep Questionnaire to assess SQ. RESULTS The study was carried out with 102 patients who underwent the TT. The mean age of the participants were 48.94 years. The mean scores for the scale items indicated that during the procedure and on the first day of post-TT, the pain severity of the patients was very high, their SQ was low. Pain level decreased gradually in the following days, and the SQ increased. There was a positive, strong correlation between the post-TT first day pain and first night SQ (r = 0.380, p = 0.000), second day pain and second night SQ (r = -0.537, p = 0.000), and third day pain and third night SQ (r = -0.507, p = 0.000). CONCLUSION The results of this study highlight that the pain severity of post-TT significantly affect the quality of the patients' night sleep.
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Affiliation(s)
- Seda Akutay
- Division of Nursing, Department of Surgical Nursing, Faculty of Health Sciences, Erciyes University, Kayseri, Turkey
| | - Meryem Yilmaz
- Division of Nursing, Department of Surgical Nursing, Faculty of Health Sciences, Sivas Cumhuriyet University, Sivas, Turkey
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24
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Choilek S, Karashima A, Motoike I, Katayama N, Kinoshita K, Nakao M. Subjective sleep quality, quantitative sleep features, and their associations dependent on demographic characteristics, habitual sleep–wake patterns, and distinction of weekdays/weekends. Sleep Biol Rhythms 2021. [DOI: 10.1007/s41105-021-00326-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
AbstractGenerally applicable qualifications of sleep and principles for achieving better sleep are difficult to design, because sleep quality can depend on individual demographic characteristics and lifestyles. In this study, the static and dynamic features of sleep–wake patterns were analyzed in association with quantitative sleep-related parameters and self-rated sleep quality to serve as a practical selection of sleep–wake patterns fitted to individual conditions. Data obtained over a 2-week period by actigraphy from university students and information technology workers were measured to obtain a daily subjective rating of sleep quality using the Oguri–Shirakawa–Azumi (OSA) sleep inventory. Qualitative sleep quality in terms of OSA score and quantitative sleep-related and chronobiological features were analyzed with regard to their dependency on the demographic characteristics, habitual sleep–wake patterns (HSWP), and distinction of weekdays/weekends. Multi-factor ANOVA was used to further investigate their dependencies regarding multiple ways of interactions between the demographic characteristics, HSWP, and distinction of weekdays/weekends. Subjective sleep quality and quantitative sleep-related parameters depended on the demographic characteristics, and so did their associations. The classification of day-to-day variations in HSWP showed four clusters that were effective factors for understanding their dependencies. Multi-factor analysis revealed demographic characteristics, HSWP, distinction of weekdays/weekends, and their multi-way interactions up to 3rd order as significant effectors of qualitative and quantitative quality of sleep. This study clarified how quantitative sleep-related parameters, subjective sleep quality, and their associations depended on demographic characteristics. Furthermore, their dependency was understood as a combination of multi-way interactions between the demographic characteristics, HSWP, and the distinction of weekdays/weekends. Our findings could provide a basis for the design of individually matched sleep–wake patterns.
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25
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Hermans LWA, van Gilst MM, Regis M, van den Heuvel LCE, Langen H, van Mierlo P, Krijn R, Hoondert B, Maass H, van Dijk JP, Leufkens TRM, Overeem S. Modeling sleep onset misperception in insomnia. Sleep 2021; 43:5721963. [PMID: 32016410 DOI: 10.1093/sleep/zsaa014] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 12/06/2019] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To extend and validate a previously suggested model of the influence of uninterrupted sleep bouts on sleep onset misperception in a large independent data set. METHODS Polysomnograms and sleep diaries of 139 insomnia patients and 92 controls were included. We modeled subjective sleep onset as the start of the first uninterrupted sleep fragment longer than Ls minutes, where parameter Ls reflects the minimum length of a sleep fragment required to be perceived as sleep. We compared the so-defined sleep onset latency (SOL) for various values of Ls. Model parameters were compared between groups, and across insomnia subgroups with respect to sleep onset misperception, medication use, age, and sex. Next, we extended the model to incorporate the length of wake fragments. Model performance was assessed by calculating root mean square errors (RMSEs) of the difference between estimated and perceived SOL. RESULTS Participants with insomnia needed a median of 34 minutes of undisturbed sleep to perceive sleep onset, while healthy controls needed 22 minutes (Mann-Whitney U = 4426, p < 0.001). Similar statistically significant differences were found between sleep onset misperceivers and non-misperceivers (median 40 vs. 20 minutes, Mann-Whitney U = 984.5, p < 0.001). Model outcomes were similar across other subgroups. Extended models including wake bout lengths resulted in only marginal improvements of model outcome. CONCLUSIONS Patients with insomnia, particularly sleep misperceivers, need larger continuous sleep bouts to perceive sleep onset. The modeling approach yields a parameter for which we coin the term Sleep Fragment Perception Index, providing a useful measure to further characterize sleep state misperception.
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Affiliation(s)
- Lieke W A Hermans
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands
| | - Merel M van Gilst
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands.,Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands
| | - Marta Regis
- Department of Mathematics and Computer Science, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands
| | | | - Hanneke Langen
- Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands
| | - Petra van Mierlo
- Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands
| | - Roy Krijn
- Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands
| | - Bertram Hoondert
- Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands
| | | | - Johannes P van Dijk
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands.,Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands.,Department of Orthodontics, University of Ulm, Ulm, Germany
| | - Tim R M Leufkens
- Philips Research, Eindhoven, The Netherlands.,Department of Industrial Design, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands
| | - Sebastiaan Overeem
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands.,Center for Sleep Medicine, Kempenhaeghe Foundation, Heeze, Noord Brabant, The Netherlands.,Department of Industrial Design, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands
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26
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Hermans LWA, Regis M, Fonseca P, Overeem S, Leufkens TRM, Vermeeren A, van Gilst MM. Assessing sleep-wake survival dynamics in relation to sleep quality in a placebo-controlled pharmacological intervention study with people with insomnia and healthy controls. Psychopharmacology (Berl) 2021; 238:83-94. [PMID: 32939597 PMCID: PMC7794103 DOI: 10.1007/s00213-020-05660-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 09/07/2020] [Indexed: 12/21/2022]
Abstract
RATIONALE The mechanisms underlying impaired sleep quality in insomnia are not fully known, but an important role for sleep fragmentation has been proposed. OBJECTIVES The aim of this study is to explore potential mechanisms of sleep fragmentation influencing alterations of perceived sleep quality. METHODS We analyzed polysomnography (PSG) recordings from a double-blind crossover study with zopiclone 7.5 mg and placebo, in elderly participants with insomnia complaints and age-matched healthy controls. We compared survival dynamics of sleep and wake across group and treatment. Subsequently, we used a previously proposed model to estimate the amount of sleep onset latency (SOL) misperception from PSG-defined sleep fragmentation. Self-reported and model-estimated amount of SOL misperception were compared across group and treatment, as well as model prediction errors. RESULTS In the zopiclone night, the average segment length of NREM sleep was increased (group F = 1.16, p = 0.32; treatment F = 8.89, p < 0.01; group x treatment F = 0.44, p = 0.65), while the segment length of wake was decreased (group F = 1.48, p = 0.23; treatment F = 11.49, p < 0.01; group x treatment F = 0.36, p = 0.70). The self-reported and model-estimated amount of SOL misperception were lower during the zopiclone night (self-reported group F = 6.08, p < 0.01, treatment F = 10.8, p < 0.01, group x treatment F = 2.49, p = 0.09; model-estimated F = 1.70, p = 0.19, treatment F = 16.1, p < 0.001, group x treatment F = 0.60, p = 0.55). The prediction error was not altered (group F = 1.62, p = 0.20; treatment F = 0.20, p = 0.65; group x treatment F = 1.01, p = 0.37). CONCLUSIONS Impaired subjective sleep quality is associated with decreased NREM stability, together with increased stability of wake. Furthermore, we conclude that zopiclone-induced changes in SOL misperception can be largely attributed to predictable changes of sleep architecture.
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Affiliation(s)
- Lieke W. A. Hermans
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands
| | - Marta Regis
- Department of Mathematics and Computer Science, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands
| | - Pedro Fonseca
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands ,Philips Research, High Tech Campus 34, Eindhoven, The Netherlands
| | - Sebastiaan Overeem
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands ,Sleep Medicine Center Kempenhaeghe, Sterkselseweg 65, Heeze, The Netherlands
| | | | - Annemiek Vermeeren
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, Universiteitssingel 40, Maastricht, The Netherlands
| | - Merel M. van Gilst
- Department of Electrical Engineering, Eindhoven University of Technology, De Zaale, Eindhoven, The Netherlands ,Sleep Medicine Center Kempenhaeghe, Sterkselseweg 65, Heeze, The Netherlands
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27
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Hermans LWA, Regis M, Fonseca P, Hoondert B, Leufkens TRM, Overeem S, van Gilst MM. Sleep-Wake Survival Dynamics in People with Insomnia. Nat Sci Sleep 2021; 13:349-360. [PMID: 33737849 PMCID: PMC7966352 DOI: 10.2147/nss.s295699] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 02/04/2021] [Indexed: 01/28/2023] Open
Abstract
INTRODUCTION Assessing objective measures of sleep fragmentation could yield important features reflecting impaired sleep quality in people with insomnia. Survival analysis allows the specific examination of the stability of NREM sleep, REM sleep and wake. The objective of this study was to assess the differences between survival dynamics of NREM sleep, REM sleep and wake between people with insomnia and healthy controls. METHODS We analyzed retrospective polysomnography recordings from 86 people with insomnia and 94 healthy controls. For each participant, survival dynamics of REM sleep, NREM sleep and wake were represented using Weibull distributions. We used lasso penalized parameter selection in combination with linear regression to analyze the difference between participant groups with respect to the Weibull scale and shape parameters, while correcting for age, sex, total sleep time and relevant interaction effects. RESULTS Significant effects of group were found for the NREM scale parameter, and for the wake scale and shape parameters. Results indicated that people with insomnia had less stable NREM sleep and more stable wake after sleep onset compared to healthy controls. Additionally, the altered distribution of wake segment lengths indicated an increased difficulty to fall asleep after longer awakenings in the insomnia group. However, these differences were mainly observed in younger participants. Significant effects of group for the survival parameters of REM sleep were not found. CONCLUSION As illustrated by our results, survival analysis can be very useful for disentangling different types of sleep fragmentation in people with insomnia. For instance, the current findings suggest that people with insomnia have an increased fragmentation of NREM sleep, but not necessarily of REM sleep. Additional research into the underlying mechanisms of NREM sleep fragmentation could possibly lead to a better understanding of impaired sleep quality in people with insomnia, and consequently to improved treatment.
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Affiliation(s)
- Lieke W A Hermans
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Marta Regis
- Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Pedro Fonseca
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands.,Philips Research, Eindhoven, the Netherlands
| | | | | | - Sebastiaan Overeem
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands.,Sleep Medicine Center Kempenhaeghe, Heeze, the Netherlands
| | - Merel M van Gilst
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands.,Sleep Medicine Center Kempenhaeghe, Heeze, the Netherlands
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28
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Malloggi S, Conte F, Gronchi G, Ficca G, Giganti F. Prevalence and Determinants of Bad Sleep Perception among Italian Children and Adolescents. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17249363. [PMID: 33327567 PMCID: PMC7765082 DOI: 10.3390/ijerph17249363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/10/2020] [Accepted: 12/12/2020] [Indexed: 12/13/2022]
Abstract
Although sleep problems at young ages are well investigated, the prevalence of bad sleepers and the determinants of sleep quality perception remain unexplored in these populations. For this purpose, we addressed these issues in a sample of children (n = 307), preadolescents (n = 717), and adolescents (n = 406) who completed the School Sleep Habits Survey, addressing sleep quality perception, sleep habits, sleep features, daytime behavior and sleep disturbances, circadian preference, and dreaming. The sample was split in “good sleepers” and “bad sleepers”, based on the answer to the question item assessing overall subjective sleep quality. Being a bad sleeper was reported by 11.7% of the sample, with significant between-groups differences (children: 8.3%; preadolescents: 11.3%; adolescents: 15.3%; p = 0.01). At all ages, relative to good sleepers, bad sleepers showed higher eveningness, sleepiness, and depression, longer sleep latency, more frequent insufficient sleep, nocturnal awakenings, sleep–wake behavioral problems, and unpleasant dreams (all p’s ≤ 0.01). Sleep quality perception was predicted: in children, by depressed mood, eveningness, and unpleasant dreams (all p’s ≤ 0.01); in preadolescents, by sleep latency, awakening frequency, depressed mood, sufficiency of sleep, and unpleasant dreams (all p’s < 0.01); in adolescents, by awakening frequency, depressed mood, and sufficiency of sleep (all p’s < 0.001). In children, bad subjective sleep quality appears to be mainly determined by daytime psychological features, for example, depressed mood, whereas at later ages, sleep characteristics, such as frequent awakenings, add to the former determinants. This could depend on (a) the appearance, with increasing age, of objective sleep modifications and (b) a greater attention paid by adolescents to their sleep characteristics.
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Affiliation(s)
- Serena Malloggi
- Department NEUROFARBA, University of Firenze, 50135 Firenze, Italy; (S.M.); (G.G.)
| | - Francesca Conte
- Department of Psychology, University of Campania L. Vanvitelli, 81100 Caserta, Italy; (F.C.); (G.F.)
| | - Giorgio Gronchi
- Department NEUROFARBA, University of Firenze, 50135 Firenze, Italy; (S.M.); (G.G.)
| | - Gianluca Ficca
- Department of Psychology, University of Campania L. Vanvitelli, 81100 Caserta, Italy; (F.C.); (G.F.)
| | - Fiorenza Giganti
- Department NEUROFARBA, University of Firenze, 50135 Firenze, Italy; (S.M.); (G.G.)
- Correspondence: ; Tel.: +39-055-275-5055
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29
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Wang F, Bíró É. Determinants of sleep quality in college students: A literature review. Explore (NY) 2020; 17:170-177. [PMID: 33246805 DOI: 10.1016/j.explore.2020.11.003] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/12/2020] [Accepted: 11/15/2020] [Indexed: 01/09/2023]
Abstract
PURPOSE To review the various determinants of sleep quality among college students. METHODS The PubMed, Web of Science and Cochrane Library databases were searched with the search string "sleep quality" AND "college students" for articles published between January 2007 and October 2017. Articles were excluded if they (1) examined sleep quality as a risk factor for other outcomes or (2) involved inpatients or participants under medical care. RESULTS The 112 identified studies were classified into categories according to the investigated determinants and their effect on sleep quality. Physical activity and healthy social relations improved sleep quality, while caffeine intake, stress and irregular sleep-wake patterns decreased sleep quality. Less consistent results were reported regarding eating habits and sleep knowledge, while proper napping during the day might improve overall sleep quality. CONCLUSIONS College students are vulnerable to different risk factors for sleep quality. When designing interventions to improve sleep quality among college students, the main determinants need to be taken into consideration.
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Affiliation(s)
- Feifei Wang
- Institute of Health Promotion and Sport Sciences, Faculty of Education and Psychology, Eötvös Loránd University ELTE, 1075 Budapest, Kazinczy u. 23-27, Hungary.
| | - Éva Bíró
- Division of Health Promotion, Department of Preventive Medicine, Faculty of Public Health, University of Debrecen, 4028 Debrecen Kassai út 26, Hungary
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30
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Stutz J, Eiholzer R, Spengler CM. Effects of Evening Exercise on Sleep in Healthy Participants: A Systematic Review and Meta-Analysis. Sports Med 2020; 49:269-287. [PMID: 30374942 DOI: 10.1007/s40279-018-1015-0] [Citation(s) in RCA: 94] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Current recommendations advise against exercising in the evening because of potential adverse effects on sleep. OBJECTIVES The aim of this systematic review was to investigate the extent to which evening exercise affects sleep and whether variables such as exercise intensity or duration modify the response. METHODS A systematic search was performed in PubMed, Cochrane, EMBASE, PsycINFO, and CINAHL databases. Studies evaluating sleep after a single session of evening physical exercise compared to a no-exercise control in healthy adults were included. All analyses are based on random effect models. RESULTS The search yielded 11,717 references, of which 23 were included. Compared to control, evening exercise significantly increased rapid eye movement latency (+ 7.7 min; p = 0.032) and slow-wave sleep (+ 1.3 percentage points [pp]; p = 0.041), while it decreased stage 1 sleep (- 0.9 pp; p = 0.001). Moderator analyses revealed that a higher temperature at bedtime was associated with lower sleep efficiency (SE) (b = - 11.6 pp; p = 0.020) and more wake after sleep onset (WASO; b = + 37.6 min; p = 0.0495). A higher level of physical stress (exercise intensity relative to baseline physical activity) was associated with lower SE (- 3.2 pp; p = 0.036) and more WASO (+ 21.9 min; p = 0.044). Compared to cycling, running was associated with less WASO (- 12.7 min; p = 0.037). All significant moderating effects disappeared after removal of one study. CONCLUSION Overall, the studies reviewed here do not support the hypothesis that evening exercise negatively affects sleep, in fact rather the opposite. However, sleep-onset latency, total sleep time, and SE might be impaired after vigorous exercise ending ≤ 1 h before bedtime.
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Affiliation(s)
- Jan Stutz
- Exercise Physiology Laboratory, Institute of Human Movement Sciences and Sport, ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Remo Eiholzer
- Exercise Physiology Laboratory, Institute of Human Movement Sciences and Sport, ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Christina M Spengler
- Exercise Physiology Laboratory, Institute of Human Movement Sciences and Sport, ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
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Abstract
The relationship between objective and subjective sleep quality is still debated. Here, we investigate differences in objective sleep parameters in habitual subjective good sleepers and bad sleepers with the aim of evaluating sleep continuity, stability and organization as possible determinants of subjective sleep quality. In total, 38 subjects (good sleepers, N = 18; bad sleepers, N = 20) underwent two nights of sleep recording. Traditional sleep parameters displayed no between-groups differences. Conversely, bad sleepers showed lower sleep continuity (awakenings frequency), stability (e.g. arousals and state transitions frequency) and organization (e.g. number of sleep cycles and time spent in cycles). Our findings point to the involvement of these measures in determining habitual sleep quality perception and suggest the possibility to include them in standard sleep assessments.
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32
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Regis M, Brini A, Nooraee N, Haakma R, van den Heuvel ER. Thetlinear mixed model: model formulation, identifiability and estimation. COMMUN STAT-SIMUL C 2019. [DOI: 10.1080/03610918.2019.1694153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Marta Regis
- Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Alberto Brini
- Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Nazanin Nooraee
- Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Reinder Haakma
- Personal Health Group, Philips Group Innovation Research, Eindhoven, The Netherlands
| | - Edwin R. van den Heuvel
- Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands
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33
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Gwin JA, Leidy HJ. Breakfast Consumption Augments Appetite, Eating Behavior, and Exploratory Markers of Sleep Quality Compared with Skipping Breakfast in Healthy Young Adults. Curr Dev Nutr 2018; 2:nzy074. [PMID: 30402594 PMCID: PMC6215927 DOI: 10.1093/cdn/nzy074] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 08/24/2018] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Observational studies show associations between breakfast skipping, reduced satiety, and poor sleep quality; however, intervention studies are lacking. OBJECTIVE The purpose of this study was to examine the effects of consuming breakfast compared with breakfast skipping on appetitive, hormonal, and neural markers of appetite and satiety; ad libitum food intake; and exploratory measures of sleep health in young adults. METHODS Thirteen adults [aged 23.5 ± 0.9 y (mean ± SEMs); body mass index (kg/m2): 23.6 ± 0.6] completed the following randomized crossover-design study. Participants consumed a high-protein breakfast ("Breakfast"; 340 kcal, 30 g protein, 36 g carbohydrate, 9 g fat) or skipped breakfast ("Skip") for 7 d/treatment. On day 7, an 8-h clinical testing day was completed including assessments of hunger, fullness, desire to eat, prospective food consumption (PFC), related hormones, food cue-stimulated functional magnetic resonance imaging brain scans, and ad libitum evening food intake. Sleep quantity and quality were assessed with 7-d actigraphy, 7-d sleep diaries, and sleep-related hormones. RESULTS Morning and daily hunger, desire to eat, PFC, and ghrelin decreased, whereas fullness increased after the Breakfast pattern compared with after the Skip pattern (all, P < 0.05). No difference in peptide YY (PYY) concentrations were detected. Hippocampal, parahippocampal, and middle frontal gyrus activations were reduced after the Breakfast pattern compared with the Skip pattern (all, P < 0.01). Although no differences in daily food intake were observed, the Breakfast pattern reduced evening intake of high-carbohydrate and high-fat foods (P < 0.05), whereas evening sugar intake tended to be reduced compared with the Skip pattern (P = 0.085). Although Breakfast led to shorter total sleep time (TST) compared with Skip (P < 0.05), no difference in sleep efficiency (TST/sleep period) was detected. Perceived sleep quality and sleep onset tended to improve after Breakfast compared with after Skip (P = 0.060 and P = 0.07, respectively). CONCLUSION Breakfast consumption improved appetite, satiety, and diet quality and may support some aspects of sleep health in healthy young adults. This trial was registered at clinicaltrials.gov as NCT03031132.
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Affiliation(s)
- Jess A Gwin
- Department of Nutrition Science, Purdue University, West Lafayette, IN
| | - Heather J Leidy
- Department of Nutrition Science, Purdue University, West Lafayette, IN
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Della Monica C, Johnsen S, Atzori G, Groeger JA, Dijk DJ. Rapid Eye Movement Sleep, Sleep Continuity and Slow Wave Sleep as Predictors of Cognition, Mood, and Subjective Sleep Quality in Healthy Men and Women, Aged 20-84 Years. Front Psychiatry 2018; 9:255. [PMID: 29988413 PMCID: PMC6024010 DOI: 10.3389/fpsyt.2018.00255] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 05/24/2018] [Indexed: 12/16/2022] Open
Abstract
Sleep and its sub-states are assumed to be important for brain function across the lifespan but which aspects of sleep associate with various aspects of cognition, mood and self-reported sleep quality has not yet been established in detail. Sleep was quantified by polysomnography, quantitative Electroencephalogram (EEG) analysis and self-report in 206 healthy men and women, aged 20-84 years, without sleep complaints. Waking brain function was quantified by five assessments scheduled across the day covering objectively assessed performance across cognitive domains including sustained attention and arousal, decision and response time, motor and sequence control, working memory, and executive function as well as self-reports of alertness, mood and affect. Controlled for age and sex, self-reported sleep quality was negatively associated with number of awakenings and positively associated with the duration of Rapid Eye Movement (REM) sleep, but no significant associations with Slow Wave Sleep (SWS) measures were observed. Controlling only for age showed that associations between objective and subjective sleep quality were much stronger in women than in men. Analysis of 51 performance measures demonstrated that, after controlling for age and sex, fewer awakenings and more REM sleep were associated significantly with better performance on the Goal Neglect task, which is a test of executive function. Factor analysis of the individual performance measures identified four latent variables labeled Mood/Arousal, Response Time, Accuracy, and Visual Perceptual Sensitivity. Whereas Mood/Arousal improved with age, Response Times became slower, while Accuracy and Visual perceptual sensitivity showed little change with age. After controlling for sex and age, nominally significant association between sleep and factor scores were observed such that Response Times were faster with more SWS, and Accuracy was reduced where individuals woke more often or had less REM sleep. These data identify a positive contribution of SWS to processing speed and in particular highlight the importance of sleep continuity and REM sleep for subjective sleep quality and performance accuracy across the adult lifespan. These findings warrant further investigation of the contribution of sleep continuity and REM sleep to brain function.
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Affiliation(s)
- Ciro Della Monica
- Surrey Clinical Research Centre, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | - Sigurd Johnsen
- Surrey Clinical Research Centre, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | - Giuseppe Atzori
- Surrey Clinical Research Centre, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | - John A Groeger
- Division of Psychology, Nottingham Trent University, Nottingham, United Kingdom
| | - Derk-Jan Dijk
- Surrey Clinical Research Centre, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom.,Surrey Sleep Research Centre, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
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