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Åkerstedt T, Bellocco R, Widman L, Eriksson J, Ye W, Adami HO, Trolle Lagerros Y. The association of short and long sleep with mortality in men and women. J Sleep Res 2024; 33:e13931. [PMID: 37192602 DOI: 10.1111/jsr.13931] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 04/12/2023] [Accepted: 04/25/2023] [Indexed: 05/18/2023]
Abstract
Both short (< 6 hr) and long (> 8 hr) sleep are associated with increased mortality. We here investigated whether the association between sleep duration and all-cause, cardiovascular disease and cancer mortality differs between men and women. A cohort of 34,311 participants (mean age and standard deviation = 50.5 ± 15.5 years, 65% women), with detailed assessment of sleep at baseline and up to 20.5 years of follow-up (18 years for cause-specific mortality), was analysed using Cox proportional hazards model to estimate HRs with 95% confidence intervals. After adjustment for covariates, all-cause, cardiovascular disease and cancer mortalities were increased for both < 5 hr and ≥ 9 hr sleep durations (with 6 hr as reference). For all-cause mortality, women who slept < 5 hr had a hazard ratio = 1.54 (95% confidence interval = 1.32-1.80), while the corresponding hazard ratio was 1.05 (95% confidence interval = 0.88-1.27) for men, the interaction being significant (p < 0.05). For cardiovascular disease mortality, exclusion of the first 2 years of exposure, as well as competing risk analysis eliminated the originally significant interaction. Cancer mortality did not show any significant interaction. Survival analysis of the difference between the reference duration (6 hr) and the short duration (< 5 hr) during follow-up showed a gradually steeper reduction of survival time for women than for men for all-cause mortality. We also observed that the lowest cancer mortality appeared for the 5-hr sleep duration. In conclusion, the pattern of association between short sleep duration and all-cause mortality differed between women and men, and the difference between men and women increased with follow-up time.
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Affiliation(s)
- Torbjörn Åkerstedt
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Stress Research Institute, Department of Psychology, Stockholm University, Stockholm, Sweden
| | - Rino Bellocco
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
- Department of Statistics and Quantitative Methods, University of Milano-Bicocca, Milan, Italy
| | - Linnea Widman
- Division of Biostatistics, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Julia Eriksson
- Division of Biostatistics, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Weimin Ye
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Hans-Olov Adami
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
- Clinical Effectiveness Group, Institute of Health and Society, University of Oslo, Oslo, Norway
| | - Ylva Trolle Lagerros
- Clinical Epidemiology Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
- Center for Obesity, Academic Specialist Center, Stockholm Health Services, Stockholm, Sweden
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Imran Patel S, R. Erwin M, Olmstead R, Jean-Louis G, Parthasarathy S, D. Youngstedt S. Comparisons of Sleep, Demographics, and Health-Related Variables in Older Long and Average Duration Sleepers. Sleep Sci 2023; 16:165-173. [PMID: 37425974 PMCID: PMC10325844 DOI: 10.1055/s-0043-1770804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2023] Open
Abstract
Introduction Long sleep duration is associated with many health risks, particularly in older adults, but little is known about other characteristics associated with long sleep duration. Methods Across 5 sites, adults aged 60-80 years who reported sleeping 8-9 h ("long sleepers", n = 95) or 6-7.25 h ("average sleepers", n = 103) were assessed for two weeks using actigraphy and sleep diary. Demographic and clinical characteristics, objective sleep apnea screening, self-reported sleep outcomes, and markers of inflammation and glucose regulation were measured. Results Compared to average sleepers, long sleepers had a greater likelihood of being White and unemployed and/or retired. Long sleepers also reported longer time in bed, total sleep time and wake after sleep onset by sleep diary and by actigraphy. Other measures including medical co-morbidity, apnea/hypopnea index, sleep related outcomes such as sleepiness, fatigue, depressed mood, or markers of inflammation and glucose metabolism did not differ between long and average sleepers. Conclusion Older adults with long sleep duration were more likely to be White, report unemployment and retirement suggesting the social factors or related sleep opportunity contributed to long sleep duration in the sample. Despite known health risks of long sleep duration, neither co-morbidity nor markers of inflammation or metabolism differed in older adults with long sleep duration compared with those with average sleep duration.
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Affiliation(s)
- Salma Imran Patel
- Division of Pulmonary, Allergy, Critical Care Medicine and Sleep Medicine, University of Arizona, UAHS Center for Sleep and Circadian Sciences, Tucson, Arizona, United States
| | - Michael R. Erwin
- Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, and Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, United States
| | - Richard Olmstead
- Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, and Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, United States
| | - Girardin Jean-Louis
- Department of Psychiatry, NYU Grossman School of Medicine, New York, New York, United States
| | - Sairam Parthasarathy
- Division of Pulmonary, Allergy, Critical Care Medicine and Sleep Medicine, University of Arizona, UAHS Center for Sleep and Circadian Sciences, Tucson, Arizona, United States
| | - Shawn D. Youngstedt
- Edson College of Nursing and Health Innovation, Arizona State University, Phoenix, Arizona, United States
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Ruan H, Zheng Y, Yang J, Li L, Zhang M, Wang Z, He S. Changes in daily sleep duration and subsequent risk of mortality among older people. Sleep Med 2023; 101:252-259. [PMID: 36455297 DOI: 10.1016/j.sleep.2022.11.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 10/30/2022] [Accepted: 11/14/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND Single self-reported measures of daily sleep duration are associated with adverse health outcomes; however, the association between changes in daily sleep duration and all-cause mortality has not been thoroughly evaluated among a large group of older people. METHODS Using data from the Chinese Longitudinal Healthy Longevity Surveys, a total of 8588 older participants were included in the present study. Changes in daily sleep duration were assessed using annual changes, and Cox regression analysis examined the association of the annual changes with mortality. RESULTS The median age of the study population was 82.00 (IQR: 72.00, 90.00) years, and 3974 (46.27%) participants were men. During a median follow-up period of 3.81 (IQR: 2.03, 6.74) years, 5100 (59.39%) deaths were recorded. After adjusting for initial daily sleep duration and other confounders, there was a non-linear relationship between annual changes in daily sleep duration and all-cause mortality. Annual changes were not associated with mortality before 0.0 h/year, and mortality risk increased after 0.0 h/year, specially after 1 h/year (adjusted HR: 1.32 per 1-hour/year increment, 95% CI: 1.18-1.47). Compared to the stable group (annual changes between -1 and 1 h), adjusted HRs for mortality were 0.98 (95% CI: 0.89-1.08) for the shorter group (annual decline more than 1 h) and 1.29 (95% CI: 1.19-1.41) for the longer group (annual increase greater than 1 h), respectively. Stratified and sensitivity analyses suggested robustness of the results. CONCLUSIONS The present study suggested there was a non-linear relationship between annual changes in daily sleep duration and all-cause mortality among older people: longer changes were associated with higher mortality; while, shorter changes were not associated with mortality. Specially, mortality risk increased significantly with longer than 1 h of annual changes. The findings highlight the importance of closely monitoring the changes in daily sleep duration among older people.
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Affiliation(s)
- Haiyan Ruan
- Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China; Department of Cardiology, Hospital of Traditional Chinese Medicine, Shuangliu District, Chengdu, China
| | - Yi Zheng
- Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China
| | - Jing Yang
- Maternal and Child Health Hospital, Longquanyi District, Chengdu, China
| | - Liying Li
- Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China
| | - Muxin Zhang
- Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China; Department of Cardiology, First People's Hospital, Longquanyi District, Chengdu, China
| | - Ziqiong Wang
- Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China
| | - Sen He
- Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China.
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Åkerstedt T, Trolle-Lagerros Y, Widman L, Ye W, Adami HO, Bellocco R. Sleep duration and mortality, influence of age, retirement, and occupational group. J Sleep Res 2021; 31:e13512. [PMID: 34741361 DOI: 10.1111/jsr.13512] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 10/16/2021] [Accepted: 10/18/2021] [Indexed: 01/30/2023]
Abstract
Previous work has shown that both long and short sleep duration is associated with increased mortality, with lowest risk around 7 hr. This has had widespread impact on views on the optimal sleep duration. However, age, being employed/retired, and blue-/white-collar status, may influence the time available for sleep and thus, confound the association. We investigated the role of these factors on the association between sleep duration and mortality. We used employed and retired participants (N = 25,430) from the Swedish National March Cohort and Cox proportional hazards regression to model the shape of the association. We found a significant U-shaped association in a multivariable model with a hazard ratio (HR) of 1.24 (95% confidence interval [CI] 1.10, 1.39) for <5-hr sleep duration, and a HR of 1.30 (95% CI 1.12, 1.51) for ≥9-hr sleep duration, with the lowest HR for 7 hr, but with a span of low HRs from 5 to 8 hr. Unadjusted values showed a pronounced U-shape. Adjusting for age accounted for most of the attenuation in the multivariable model. Stratification into five age groups showed a significant U-shape only in those aged >60.3 years at baseline. The shape of the association did not differ between blue-/white-collar workers, nor between employed and retired groups. We conclude that the U-shaped association between sleep duration and mortality is present only in older individuals.
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Affiliation(s)
- Torbjörn Åkerstedt
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Department of Psychology, Stress Research Institute, Stockholm University, Stockholm, Sweden
| | - Ylva Trolle-Lagerros
- Clinical Epidemiology Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden.,Center for Obesity, Academic Specialist Center, Stockholm Health Services, Stockholm, Sweden
| | - Linnea Widman
- Division of Biostatistics, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Weimin Ye
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Hans-Olov Adami
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.,Clinical Effectiveness Group, Institute of Health and Society, University of Oslo, Oslo, Norway
| | - Rino Bellocco
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.,Department of Statistics and Quantitative Methods, University of Milano-Bicocca, Milan, Italy
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