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Brown SM, Donovan CM, Williamson AA. Maternal Sleep Quality and Executive Function are Associated with Perceptions of Infant Sleep. Behav Sleep Med 2024; 22:697-708. [PMID: 38747569 PMCID: PMC11365773 DOI: 10.1080/15402002.2024.2355473] [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] [Indexed: 08/30/2024]
Abstract
OBJECTIVES This study examined the associations among maternal sleep quality, executive function, and perceptions of infant sleep in a sample of families recruited from human service and public health systems. METHODS Seventy-three mothers of infants 5-14 months old were included in the study. Mothers racially and ethnically identified as American Indian/Alaskan Native (4.1%), Asian (4.1%), Black/African American (12.3%), Latina (23.3%), more than one race (12.3%), Pacific Islander (1.4%), and White (42.5%). Mothers completed questionnaires assessing their own sleep (Pittsburgh Sleep Quality Index) and executive function (Behavior Rating Inventory of Executive Function) as well as their perceptions about their infant's sleep (Brief Infant Sleep Questionnaire). RESULTS Results of the path analysis indicated significant direct effects among maternal sleep quality, executive function, and perceptions of infant sleep. Significant indirect effects were found such that poor maternal sleep quality was linked to poorer perceptions of infant sleep through maternal executive dysfunction, adjusting for infant sleep patterns, infant age, and maternal race and ethnicity. CONCLUSIONS The current study highlights the potential role of maternal behavioral and cognitive factors in shaping mothers' perceptions about infant sleep. These findings support the need for health professionals and researchers to consider maternal sleep quality and executive function when addressing mothers' concerns about infant sleep.
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Affiliation(s)
- Samantha M Brown
- College of Health and Human Sciences, Department of Human Development and Family Studies, Colorado State University, Fort Collins, CO, USA
| | - Courtney M Donovan
- School of Education and Human Development, Department of Research and Evaluation Methods, University of Colorado Denver, Denver, CO, USA
| | - Ariel A Williamson
- The Ballmer Institute for Children's Behavioral Health, University of Oregon, Eugene, OR, USA
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Segre G, Clavenna A, Roberti E, Campi R, Rapisardi G, Bonati M. Children's nocturnal awakenings and sleep duration during the first two years of life in the NASCITA cohort study. Sleep Med 2024; 121:127-134. [PMID: 38964278 DOI: 10.1016/j.sleep.2024.06.027] [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: 01/12/2024] [Revised: 05/20/2024] [Accepted: 06/25/2024] [Indexed: 07/06/2024]
Abstract
PURPOSE Previous studies have analyzed the characteristics and prevalence of sleep disturbances among Italian children. Less attention has been paid, however, to the factors involved in sleep disturbances in the first two years of life. The goals of the present study were, therefore: 1) to provide a developmental trajectory of Italian infants' night awakenings and duration during the first two years of life and 2) to analyze which factors affect night awakenings the most over time. METHODS Data for this study were collected in the NASCITA cohort. During the well-child visits conducted at 6, 12, and 24 months, pediatricians asked parents to report if the child had any sleep disturbances, especially frequent night awakenings. Univariate and multivariable analyses were performed to test the association between child and family variables and the likelihood of frequent awakenings. RESULTS 2973 toddlers, out of 5054 initially enrolled newborns, were included in this study; 875 (29.4 %) of whom presented frequent awakenings in at least one visit (peak of prevalence of 19.8 % at 12 months). Bed-sharing (adjusted OR 2.53; 95%CI:2.05-3.12) and living in the northern Italy (aOR 2.25; 95%CI:1.80-2.81) were the variables more strongly associated with an increased likelihood of frequent awakenings in the binomial logistic regression, while sleeping alone was associated with a decreased chance (aOR 0.62; 95%CI 0.45-0.89). A short sleep duration (<11 h/day) was reported for 801 (26.9 %) at 12 months, for 743 (25.0 %) at 24 months of age; in 383 cases, the short sleep duration was reported at both time points. An association was observed between frequent awakenings at 12 or 24 months and short sleep duration (OR 1.23; 95%CI 1.05-1.44 -ꭓ2 6.25, p = 0.012). CONCLUSIONS The current study identified some early predictors of frequent awakenings during the first two years of life. Since optimal sleep practices in children are essential for their development, effective, early interventions must be defined and integrated into pediatric care practices.
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Affiliation(s)
- Giulia Segre
- Medical Epidemiology Department¸ Laboratory of Child Health and Development Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Antonio Clavenna
- Medical Epidemiology Department¸ Laboratory of Child Health and Development Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy.
| | - Elisa Roberti
- Medical Epidemiology Department¸ Laboratory of Child Health and Development Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Rita Campi
- Medical Epidemiology Department¸ Laboratory of Child Health and Development Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | | | - Maurizio Bonati
- Medical Epidemiology Department¸ Laboratory of Child Health and Development Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
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Fischer AR, Doudell KR, Cundiff JM, Green SRM, Lavender CA, Gunn HE. Maternal Sleep Health, Social Support, and Distress: A Mixed-Methods Analysis of Mothers of Infants and Young Children in Rural US. Behav Sleep Med 2024; 22:650-673. [PMID: 38600856 DOI: 10.1080/15402002.2024.2339818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
OBJECTIVES The purpose of this study was to explore sleep health in rural maternal populations through a social-ecological framework and identify risk and protective factors for this population. METHODS 39 individuals who are mothers of infants or children under the age of 5 years completed an online survey, 35 of which completed a subsequent semi-structured interview. Recruitment was limited to one rural community and was in partnership with community healthcare providers. Results were integrated using a convergent, parallel mixed-methods design. RESULTS Poor sleep health and high prevalence of insomnia symptoms in rural mothers were evident and associated with social support and maternal distress. Qualitative content from interviews indicated that well-established precipitating and perpetuating factors for insomnia may contribute to poor maternal sleep health. Results also revealed a gap in knowledge and language surrounding sleep health among rural mothers. CONCLUSIONS Sleep health is challenged during the transition to motherhood and rural mothers have less access to specialized perinatal and behavioral health care than their urban counterparts. In this sample, poor sleep was attributable to distress in addition to nocturnal infant and child sleep patterns which has implications for psychoeducation and promotion of sleep health in mothers. Sleep is a modifiable health indicator that is associated with several other maternal health outcomes and should be considered an element of a comprehensive maternal health for prevention and intervention across individual, interpersonal, and societal domains of the social-ecological model of sleep health.
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Affiliation(s)
| | - Kelly R Doudell
- Department of Psychology, University of Alabama, Tuscaloosa, AL, USA
| | - Jenny M Cundiff
- Department of Psychology, University of Alabama, Tuscaloosa, AL, USA
| | | | - Catherine A Lavender
- College of Community Health Sciences, University of Alabama, Tuscaloosa, AL, USA
| | - Heather E Gunn
- Department of Psychology, University of Alabama, Tuscaloosa, AL, USA
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Bante A, Ayele G, Alamirew B, Ahmed M. Regulatory problems and associated factors among infants in Arba Minch health and demographic surveillance system sites, southern Ethiopia. PLoS One 2024; 19:e0305722. [PMID: 38889163 PMCID: PMC11185483 DOI: 10.1371/journal.pone.0305722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/03/2024] [Indexed: 06/20/2024] Open
Abstract
INTRODUCTION Infant regulatory problems are a common source of concern for parents, and they increase the risk of impaired infant-caregiver bonding. Despite their impact, they are often overlooked in Ethiopia. Hence, this study aimed to determine the prevalence and associated factors of infant regulatory problems in Arba Minch Health and Demographic Surveillance System sites in southern Ethiopia. METHODS A community-based cross-sectional study was conducted among 451 mother-infant pairs from February 15 to March 15, 2022. Regulatory problems were assessed using diagnostic interviews for regulatory problems. The data was collected using an open data kit Android application and analyzed with Stata version 17.0. Bivariable and multivariable logistic regression analyses were computed to identify factors associated with each infant regulatory problem. Statistical significance was declared at a p-value < 0.05. RESULTS In this study, four hundred forty-nine mother-infant pairs were involved, with a response rate of 99.5%. The prevalence of excessive crying, feeding problems, and sleeping difficulties was 14.03% [95% CI: 10.95, 17.59], 20.04% [95% CI: 16.44, 24.05], and 13.59% [95% CI: 10.55, 17.11], respectively. Attending primary education (AOR: 2.54, 95% CI: 1.22, 5.32), high perceived social support (AOR: 0.32, 95% CI: 0.12, 0.89), feeding problems (AOR: 5.0, 95% CI: 2.65, 9.45), and depression, anxiety, and stress (DAS) symptoms (AOR: 2.67, 95% CI: 1.19, 5.98) were associated with excessive crying. In addition, a family size of above five (AOR: 1.82, 95% CI: 1.03, 3.22), excessive crying (AOR: 3.76, 95% CI: 1.85, 7.65), sleeping problems (AOR: 2.29, 95% CI: 1.13, 4.65), comorbid DAS symptoms (AOR: 3.42, 95% CI: 1.64, 7.11), alcohol abuse (AOR: 1.89, 95% CI: 1.04, 3.42), and late initiation of complementary feeding (AOR: 2.67, 95% CI: 1.22, 5.88) were associated with feeding problems. Furthermore, attending primary education (AOR: 2.35, 95% CI: 1.16, 4.77), feeding problems (AOR: 3.47, 95% CI: 1.86, 6.48), and comorbid DAS symptoms (AOR: 3.23, 95% CI: 1.53, 6.84) were associated with sleeping problems. CONCLUSIONS Approximately one-third of infants encountered at least one regulatory problem. Level of education, perceived social support, feeding problems, and DAS symptoms were associated with excessive crying. Large family sizes, excessive crying, sleeping problems, comorbid DAS symptoms, alcohol abuse and, late initiation of complementary feeding increase the likelihood of feeding problems. Moreover, attending primary education, feeding problems, and comorbid DAS symptoms increase the odds of sleeping problems. Continuous guidance and support on infant soothing techniques, cognitive and behavioral therapy, and counselling on appropriate coping strategies for postpartum women are imperative to reduce the burden of infant regulatory problems.
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Affiliation(s)
- Agegnehu Bante
- School of Nursing, College of Medicine and Health Sciences, Arba Minch University, Arba Minch, Ethiopia
| | - Gistane Ayele
- School of Public Health, College of Medicine and Health Sciences, Arba Minch University, Arba Minch, Ethiopia
| | - Birhanu Alamirew
- School of Nursing, College of Medicine and Health Sciences, Arba Minch University, Arba Minch, Ethiopia
| | - Muluken Ahmed
- School of Medicine, College of Medicine and Health Sciences, Arba Minch University, Arba Minch, Ethiopia
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Premo EM, Magnuson KA, Lorenzo NE, Fox NA, Noble KG. Mental health and sleep quality of low-income mothers of one-year-olds during the COVID-19 pandemic. Infant Ment Health J 2023; 44:572-586. [PMID: 37439103 PMCID: PMC10403317 DOI: 10.1002/imhj.22074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 03/23/2023] [Accepted: 03/28/2023] [Indexed: 07/14/2023]
Abstract
The COVID-19 pandemic and subsequent social restrictions created an unprecedented context for families raising young children. Although studies have documented detrimental effects of the pandemic on maternal well-being, less is known about how the pandemic specifically impacted low-income mothers. We examined depression, anxiety, and sleep quality among low-income mothers of one-year-olds during the early months of the pandemic using data from the Baby's First Years study. Focusing on the control group (n = 547), we compared mothers interviewed before March 14th, 2020 (n = 342) to mothers interviewed between March 14th and June 30th, 2020 (n = 205) to determine whether the pandemic was associated with differences in mental health and sleep quality. Mothers were recruited from four cities in the United States, and most of the sample identified as Hispanic (42.2%) or Black, non-Hispanic (38.6%). We found that mothers interviewed during the pandemic reported better mental health and sleep quality. While we cannot speak to longer-term impacts of the pandemic, it is possible low-income mothers experienced relief from daily stressors during the initial shelter-in-place orders, which may have led to improvements in well-being. These results have implications for understanding how complex life stressors influence mental health and sleep quality among low-income mothers raising young children.
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Affiliation(s)
- Elizabeth M. Premo
- Sandra Rosenbaum School of Social Work, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Katherine A. Magnuson
- Sandra Rosenbaum School of Social Work, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Nicole E. Lorenzo
- Department of Human Development and Quantitative Methodology, University of Maryland, College Park, Maryland, USA
| | - Nathan A. Fox
- Department of Human Development and Quantitative Methodology, University of Maryland, College Park, Maryland, USA
| | - Kimberly G. Noble
- Department of Biobehavioral Sciences and Human Development, Teachers College, Columbia University, New York City, New York, USA
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Zhang Z, Matenchuk BA, Skow RJ, Davenport MH, Carson V. Associations between demographic and parental factors and infant sleep characteristics. Sleep Biol Rhythms 2023; 21:221-232. [PMID: 38469278 PMCID: PMC10900024 DOI: 10.1007/s41105-022-00438-w] [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: 06/25/2022] [Accepted: 12/03/2022] [Indexed: 12/23/2022]
Abstract
Although sleep problems are highly prevalent in infants, the intrinsic and extrinsic factors that influence sleep consolidation and regulation in this age group are not well understood. This study aimed to examine the cross-sectional associations of demographic and parental factors with infant sleep characteristics. Participants were 97 Canadian mother-infant dyads primarily from Edmonton, Alberta. Demographic factors (e.g., infant age), parenting practices (e.g., sleep position, sleep initiation methods), and infants sleep characteristics (e.g., the frequency of nighttime awakenings) were assessed using the Brief Infant Sleep Questionnaire. Maternal sleep characteristics (e.g., nighttime sleep duration) were assessed using Actigraph accelerometers. Infant age (mean = 4.24 ± 2.90) was associated with most infant sleep characteristics. In multiple regression models for infant nighttime sleep duration, after removing influential observations, a negative association for side (vs. prone) sleep position was, respectively, observed. In multiple regression models for the frequency of nighttime awakenings in infants, positive associations for infants falling asleep while feeding (vs. in bed alone) and side (vs. prone) sleep position were consistently observed after removing influential observations. Lower nighttime sleep efficiency (B = - 0.08, 95%CI: - 0.13, - 0.02) and longer nighttime wake after sleep onset (B = 1.03, 95%CI: 0.41, 1.65) in mothers were associated with more frequent nighttime awakenings in infants. After removing influential observations, more frequent nighttime awakenings (B = 0.35; 95%CI: 0.09, 0.61) and longer total sleep duration (B = 0.33, 95%CI: 0.11, 0.55) in mothers were also associated with more frequent nighttime awakenings in infants. Sleep initiation methods with less parental involvement, and more continuous and efficient maternal nighttime sleep, tended to be associated with less interrupted infant sleep.
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Affiliation(s)
- Zhiguang Zhang
- Faculty of Kinesiology, Sport and Recreation, University of Alberta, Edmonton, AB T6G 2H9 Canada
| | - Brittany A. Matenchuk
- Program for Pregnancy and Postpartum Health, Physical Activity and Diabetes Laboratory, Faculty of Kinesiology, Sport, and Recreation, Women and Children’s Health Research Institute, Alberta Diabetes Institute, University of Alberta, Edmonton, AB Canada
| | - Rachel J. Skow
- Program for Pregnancy and Postpartum Health, Physical Activity and Diabetes Laboratory, Faculty of Kinesiology, Sport, and Recreation, Women and Children’s Health Research Institute, Alberta Diabetes Institute, University of Alberta, Edmonton, AB Canada
| | - Margie H. Davenport
- Program for Pregnancy and Postpartum Health, Physical Activity and Diabetes Laboratory, Faculty of Kinesiology, Sport, and Recreation, Women and Children’s Health Research Institute, Alberta Diabetes Institute, University of Alberta, Edmonton, AB Canada
| | - Valerie Carson
- Faculty of Kinesiology, Sport and Recreation, University of Alberta, Edmonton, AB T6G 2H9 Canada
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Lo BK, McTernan ML, Haines J, Savage JS, Kugler KC, Haneuse S, Redline S, Taveras EM, Davison KK. Development and Psychometric Properties of the Sleep Parenting Scale for Infants. Behav Med 2023; 49:151-161. [PMID: 34791992 PMCID: PMC9348862 DOI: 10.1080/08964289.2021.2002799] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 10/07/2021] [Accepted: 10/31/2021] [Indexed: 01/14/2023]
Abstract
Although infants' sleep behaviors are shaped by their interactions with parents at bedtime, few tools exist to capture parents' sleep parenting practices. This study developed a Sleep Parenting Scale for Infants (SPS-I) and aimed to (1) explore and validate its factorial structure, (2) examine its measurement invariance across mothers and fathers, and (3) investigate its reliability and concurrent and convergent validity. SPS-I was developed via a combination of items modified from existing scales and the development of novel items. Participants included 188 mothers and 152 mother-father dyads resulting in 340 mothers and 152 fathers; about half were non-Hispanic white. Mothers and fathers completed a 14-item SPS-I for their 12-month-old infant. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were used to explore and validate SPS-I's underlying structure. Multigroup CFA was used to examine measurement invariance across mothers and fathers. Reliability was examined using Cronbach's alpha. Concurrent validity was assessed using linear regressions examining associations between SPS-I factors and parent-reported infants nighttime sleep duration. Convergent validity was assessed using paired-sample t-tests to test whether the SPS-I subscale scores were similar between mothers and fathers in the same household. EFA and CFA confirmed a 3-factor, 12-item model: sleep routines, sleep autonomy, and screen media in the sleep environment. SPS-I was invariant across mothers and fathers and was reliable. Concurrent and convergent validity were established. SPS-I has good psychometric properties, supporting its use for characterizing sleep routines, sleep autonomy, and screen media in the sleep environment by mothers and fathers.Supplemental data for this article is available online at https://doi.org/10.1080/08964289.2021.2002799 .
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Affiliation(s)
- Brian K. Lo
- School of Social Work, Boston College, Chestnut Hill, MA, USA
| | | | - Jess Haines
- Department of Family Relations & Applied Nutrition, University of Guelph, Guelph, ON, Canada
| | - Jennifer S. Savage
- Center for Childhood Obesity Research and Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Kari C. Kugler
- Department of Biobehavioral Health, The Pennsylvania State University, University Park, PA, USA
| | - Sebastien Haneuse
- Department of Biostatistics, Harvard Chan School of Public Health, Boston, MA, USA
| | - Susan Redline
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham & Women’s Hospital & Harvard Medical School, Boston, MA, USA
| | - Elsie M. Taveras
- Department of Nutrition, Harvard Chan School of Public Health, Boston, MA, USA
- Division of General Academic Pediatrics, Department of Pediatrics, Massachusetts General Hospital for Children, Boston, MA, USA
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Lucchini M, Ordway MR, Kyle MH, Pini N, Barbosa JR, Sania A, Shuffrey LC, Firestein MR, Fernández CR, Fifer WP, Alcántara C, Monk C, Dumitriu D. Racial/ethnic disparities in infant sleep in the COVID-19 Mother Baby Outcomes (COMBO) study. Sleep Health 2022; 8:429-439. [PMID: 36038499 PMCID: PMC9411732 DOI: 10.1016/j.sleh.2022.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 06/13/2022] [Accepted: 06/20/2022] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Investigate racial and ethnic differences in infant sleep and examine associations with insurance status and parent-infant bedtime behavioral factors (PIBBF). METHODS Participants are part of the COVID-19 Mother Baby Outcomes (COMBO) Initiative, Columbia University. Data on infant sleep (night, day and overall sleep duration, night awakenings, latency, infant's sleep as a problem) were collected at 4 months postpartum. Regressions estimated associations between race/ethnicity, insurance status, PIBBF and infants' sleep. RESULTS A total of 296 infants were eligible (34.4% non-Hispanic White [NHW], 10.1% Black/African American [B/AA], 55.4% Hispanic). B/AA and Hispanic mothers were more likely to have Medicaid, bed/room-share, and report later infant bedtime compared to NHW mothers. Infants of B/AA mothers had longer sleep latency compared to NHW. Infants of Hispanic mothers slept less at night (∼70 ± 12 minutes) and more during the day (∼41 ± 12 minutes) and Hispanic mothers were less likely to consider infants' sleep as a problem compared to NHW (odds ratio 0.4; 95% confidence interval: 0.2-0.7). After adjustment for insurance status and PIBBF, differences by race/ethnicity for night and day sleep duration and perception of infant's sleep as a problem persisted (∼32 ± 14 minutes, 35 ± 15 minutes, and odds ratio 0.4; 95% confidence interval: 0.2-0.8 respectively). Later bedtime was associated with less sleep at night (∼21 ± 4 minutes) and overall (∼17 ± 5 minutes), and longer latency. Infants who did not fall asleep independently had longer sleep latency, and co-sleeping infants had more night awakenings. CONCLUSIONS Results show racial/ethnic differences in sleep in 4-month-old infants across sleep domains. The findings of our study suggest that PIBBF have an essential role in healthy infant sleep, but they may not be equitably experienced across racial/ethnic groups.
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Affiliation(s)
- Maristella Lucchini
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA.
| | | | - Margaret H Kyle
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA
| | - Nicolò Pini
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA
| | - Jennifer R Barbosa
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA
| | - Ayesha Sania
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA
| | - Lauren C Shuffrey
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA
| | - Morgan R Firestein
- Department of Psychiatry, Columbia University Irving Medical Center, New York, NY, USA
| | - Cristina R Fernández
- New York-Presbyterian Hospital, New York, New York, USA; Division of Child and Adolescent Health, Department of Pediatrics, Columbia University Irving Medical Center, New York, New York, USA
| | - William P Fifer
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA; New York State Psychiatric Institute, New York, New York, USA
| | | | - Catherine Monk
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA; New York State Psychiatric Institute, New York, New York, USA; Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, New York, USA
| | - Dani Dumitriu
- Division of Developmental Neuroscience, Department of Psychiatry, Columbia University Irving Medical Center, New York, New York, USA; Division of Child and Adolescent Health, Department of Pediatrics, Columbia University Irving Medical Center, New York, New York, USA; Sackler Institute, Zuckerman Institute, and the Columbia Population Research Center, Columbia University, New York, New York, USA.
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9
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Cohen MF, Corwin E, Dunlop AL, Brennan PA. Psychological Distress Prospectively Predicts Later Sleep Quality in a Sample of Black American Postpartum Mothers. Behav Sleep Med 2022; 20:442-459. [PMID: 34120540 PMCID: PMC8665932 DOI: 10.1080/15402002.2021.1932499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Objective: Previous longitudinal studies have demonstrated prospective relationships between maternal sleep quality and subsequent psychological distress in the postpartum period. Despite evidence for prospective relationships between mood and subsequent sleep quality in adult populations, this direction has not been examined in postpartum women. We aimed to test prospective relationships between sleep quality and subsequent psychological distress, as well as the plausible reverse possibility, in a sample of Black American postpartum mothers (n = 146).Participants: Mothers were recruited prenatally from two hospitals in a Southeastern city of the United States. Eligible and interested mothers enrolled in a follow-up study on infant development. Data from the current study were obtained during the follow-up study.Method: Mothers reported on their psychological distress (i.e., anxiety, depression, stress) and sleep quality at 3- and 6-months postpartum. We performed hierarchical linear regressions to explore whether 1) maternal sleep quality at 3-months postpartum would predict maternal psychological distress at 6-months postpartum, after adjustment for mothers' earlier psychological distress, and 2) whether psychological distress at 3-months postpartum would predict maternal sleep quality at 6-months postpartum, after adjustment for mothers' earlier sleep quality.Results: Maternal sleep quality at 3-months postpartum was not a significant predictor of psychological distress at 6-months postpartum. However, maternal psychological distress at 3-months postpartum was a significant predictor of sleep quality at 6-months postpartum.Conclusions: Mothers' psychological distress earlier in the postpartum was a significant predictor of their later sleep quality. Replication is needed in large, prospective studies, with results stratified by race/ethnicity.
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Affiliation(s)
- Madeleine F. Cohen
- Emory University Department of Psychology, 36 Eagle Row, Atlanta, GA 30322, United States of America
| | - Elizabeth Corwin
- Emory University Neil Hodgson Woodruff School of Nursing, 1520 Clifton Road, Atlanta, GA 30322, United States of America
| | - Anne L. Dunlop
- Emory University Neil Hodgson Woodruff School of Nursing, 1520 Clifton Road, Atlanta, GA 30322, United States of America
| | - Patricia A. Brennan
- Emory University Department of Psychology, 36 Eagle Row, Atlanta, GA 30322, United States of America
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10
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Armstrong B, Weaver RG, Beets MW, Østbye T, Kravitz RM, Benjamin-Neelon SE. Use of Child Care Attenuates the Link Between Decreased Maternal Sleep and Increased Depressive Symptoms. J Dev Behav Pediatr 2022; 43:e330-e338. [PMID: 35075045 PMCID: PMC9177505 DOI: 10.1097/dbp.0000000000001048] [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: 06/01/2021] [Accepted: 10/12/2021] [Indexed: 01/26/2023]
Abstract
OBJECTIVE Sleep disruption is common among postpartum women and is linked with depression. Child care may alleviate parenting stress and protect new mothers against symptoms of depression. METHODS Mothers from the NURTURE study, a birth cohort of 666 women of full-term infants, completed questionnaires during home visits when their infants were 3, 6, 9, and 12 months old. The Edinburgh Postnatal Depression Scale and the Perceived Stress Scale were used to measure depressive symptoms and stress, respectively. Mothers reported total nightly sleep duration for themselves and their infants, child care arrangements, marital status, and income. We used mixed-effects models adjusting for income, marital status, and child age to examine the indirect effect of infants' sleep on maternal mental health through mothers' sleep and assessed whether patterns differed depending on child care. RESULTS Decreased maternal sleep mediated the association between infant sleep and maternal mental health. When infants slept 1 hour less than usual, mothers slept 7 fewer minutes (B = 0.19, 95% confidence interval [CI], 0.01 to 0.27) and reported more depressive symptoms (B = -0.27, 95% CI, -0.43 to -0.11) and stress (B = -0.33, 95% CI -0.58 to -0.09). Child care moderated the indirect effect; decreased maternal sleep was not associated with increased depressive symptoms (and was not a mediator) when mothers had child care (indirect effect = -0.001, 95% CI, -0.03 to 0.03). CONCLUSION Use of infant child care reduced the link between maternal sleep and depressive symptoms. Regular access to child care may be a method to mitigate feelings of depression for new mothers.
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Affiliation(s)
- Bridget Armstrong
- University of South Carolina, Department of Exercise
Science, Columbia, South Carolina, USA
| | - R. Glenn Weaver
- University of South Carolina, Department of Exercise
Science, Columbia, South Carolina, USA
| | - Michael W. Beets
- University of South Carolina, Department of Exercise
Science, Columbia, South Carolina, USA
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11
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Yang YT, Zou JJ, Wei Q, Shi YY, Zhang YH, Shi HJ. A Longitudinal Study of the Effects of Bed-Sharing Experience in Infancy on Sleep Outcomes at 2 Years Old. J Pediatr 2022; 245:142-148.e2. [PMID: 35120991 DOI: 10.1016/j.jpeds.2022.01.045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 12/29/2021] [Accepted: 01/26/2022] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To assess the effects of bed-sharing experiences in infancy on sleep patterns and sleep problems at 2 years of age. STUDY DESIGN A total of 1564 children from an ongoing Shanghai Maternal-Child Pairs Cohort were included. Bed-sharing experiences were collected when children were 2, 6, and 24 months old via caregiver-completed questionnaires (whether caregivers shared a bed with children during the night), and children's bed-sharing experiences were classified as follows: no bed-sharing, early-only bed-sharing, late-onset bed-sharing, and persistent bed-sharing. Sleep outcomes at month 24 were assessed using the Brief Infant Sleep Questionnaire. Sleep patterns and problems were compared among the 4 types of bed-sharing experiences. RESULTS Of the 1564 infants, 10.10% had no bed-sharing, 18.35% had early-only, 27.94% had late-onset, and 43.61% had persistent bed-sharing. Compared with children with no bed-sharing, children with late-onset and persistent bed-sharing had shorter nighttime sleep durations and longer daytime sleep durations (P < .05) and were more likely to snore (aOR 1.87 [95% CI 1.25-2.79]; aOR 1.68 [95% CI 1.14-2.47]) and have sleep onset difficulty (aOR 2.06 [95% CI 1.37-3.09]; aOR 2.07 [95% CI 1.41-3.05]). However, caregivers of infants in the late-onset and persistent bed-sharing groups perceived less problematic sleep (aOR 0.38 [95% CI 0.26-0.56] and aOR 0.40 [95% CI 0.28-0.58]). CONCLUSIONS Bed-sharing is a common experience among Chinese children. Although bed-sharing may reduce caregivers' perception of children's problematic sleep, late-onset or persistent bed-sharing in infancy is associated with sleep problems at 2 years of age.
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Affiliation(s)
- Yan-Ting Yang
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Jiao-Jiao Zou
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Qian Wei
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Yu-Yang Shi
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Yun-Hui Zhang
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Hui-Jing Shi
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China.
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12
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Bai L, Crosby B, Teti DM. Socioeconomic status and infant nighttime sleep across the second year of life: The moderating role of infant attachment security. Child Dev 2022; 93:845-861. [PMID: 34962285 DOI: 10.1111/cdev.13723] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study examined socioeconomic status (SES) and attachment security as predictors of infant nighttime sleep during the second year. Participants included 128 mothers (86% White) with infants (48.4% boys). Data collection took place between April, 2009 and February, 2014. At 12, 18, and 24 months, infant sleep was assessed via actigraphy and daily diaries, and attachment with the Attachment Q-Set. SES indicators included income-to-needs ratios and education. Lower SES predicted greater variability in sleep duration and later sleep timing only for less secure infants. Less secure attachment was associated with poorer sleep at both between- and within-person levels, especially when infants were 12 months of age. Results emphasize the complex interactive effects of environmental and relational factors on infant sleep.
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Affiliation(s)
- Liu Bai
- The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Brian Crosby
- The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Douglas M Teti
- The Pennsylvania State University, University Park, Pennsylvania, USA
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13
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Cohen MF, Dunlop AL, Johnson DA, Dunn Amore A, Corwin EJ, Brennan PA. Intergenerational Effects of Discrimination on Black American Children's Sleep Health. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:4021. [PMID: 35409703 PMCID: PMC8997890 DOI: 10.3390/ijerph19074021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/25/2022] [Accepted: 03/26/2022] [Indexed: 01/27/2023]
Abstract
Greater exposure to racial/ethnic discrimination among pregnant Black American women is associated with elevated prenatal depressive symptomatology, poorer prenatal sleep quality, and poorer child health outcomes. Given the transdiagnostic importance of early childhood sleep health, we examined associations between pregnant women's lifetime exposure to racial/ethnic discrimination and their two-year-old children's sleep health. We also examined women's gendered racial stress as a predictor variable. In exploratory analyses, we examined prenatal sleep quality and prenatal depressive symptoms as potential mediators of the prior associations. We utilized data from a sample of Black American women and children (n = 205). Women self-reported their lifetime experiences of discrimination during early pregnancy, their sleep quality and depressive symptoms during mid-pregnancy, and their children's sleep health at age two. Hierarchical linear multiple regression models were fit to examine direct associations between women's experiences of discrimination and children's sleep health. We tested our mediation hypotheses using a parallel mediator model. Higher levels of gendered racial stress, but not racial/ethnic discrimination, were directly associated with poorer sleep health in children. Higher levels of racial/ethnic discrimination were indirectly associated with poorer sleep health in children, via women's prenatal depressive symptomatology, but not prenatal sleep quality. Clinical efforts to mitigate the effects of discrimination on Black American women may benefit women's prenatal mental health and their children's sleep health.
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Affiliation(s)
| | - Anne L Dunlop
- Department of Gynecology and Obstetrics, School of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Dayna A Johnson
- Department of Epidemiology, Emory University, Atlanta, GA 30322, USA
| | - Alexis Dunn Amore
- Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA 30322, USA
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Lin X, Zhai R, Mo J, Sun J, Chen P, Huang Y. How do maternal emotion and sleep conditions affect infant sleep: a prospective cohort study. BMC Pregnancy Childbirth 2022; 22:237. [PMID: 35321658 PMCID: PMC8944133 DOI: 10.1186/s12884-022-04504-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 02/21/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Recent studies suggest that the incidence of infant sleep disorder is related to maternal emotional and sleep conditions, but how they influence each other is not fully understood. METHODS A total of 513 pairs of parents and infants were enrolled in this prospective cohort study. Maternal emotional and sleep conditions were assessed using a self-rating depression scale, self-rating anxiety scale, and Pittsburgh Sleep Quality Index at the third trimester and within 3 months after delivery. Infant sleep was assessed by the Brief Screening Questionnaire for Infant Sleep Problems within 3 months after birth. Expression of the glucocorticoid receptor (GR), melatonin receptors (MR), exchange proteins directly activated by cAMP (EPAC) receptors, and dopamine receptor (DR) in the placenta was detected by immunohistochemistry. Methylation of the promoter regions for the GR (NR3C1 and NR3C2), MR (MTNR1A and MTNR1B), EPAC (RASGRF1 and RASGRF2), and DR (DRD1 and DRD2) genes was assessed by next generation sequencing-based bisulfite sequencing PCR. RESULTS The incidence of sleep disorders in infants 0-3 months of age in this cohort was 40.5%. Risk factors for infant sleep disorder were low education level of the father, depression of father, maternal postpartum depression, postpartum anxiety, postpartum sleep disorder, and maternal sleep disorder extend from the third trimester to postpartum. There was no difference in expression of placental DR, GR, MR, and EPAC between mothers whose infants were with and without sleep disorders. Methylation of MTNR1B was higher and expression of MR was lower in the placenta of mothers with sleep disorder in the third trimester than in mothers without sleep disorder. Level of NR3C2 methylation was lower and GR expression was higher in the placenta of mothers with sleep disorder extend from the third trimester to postpartum than in mothers without sleep disorder. CONCLUSION Maternal sleep disorders in the third trimester could lead to decreased MR expression by up-regulating MTNR1B methylation, and then resulting in elevated cortisol and increased GR expression by down-regulating NR3C2 methylation, which could increase the incidence of maternal postpartum sleep disorders, finally, the maternal postpartum sleep disorder could result in the high incidence of infant sleep disorder.
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Affiliation(s)
- Xuemei Lin
- Department of Neonatology, Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
- Department of Neonatology, Shenshan Central Hospital of Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Shanwei, 516600, Guangdong, China
| | - Ronghui Zhai
- Department of Neonatology, Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
| | - Jiafeng Mo
- Department of Neonatology, Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
| | - Jingzhou Sun
- Department of Mathematics, Shantou University Science College, College Road, Shantou, 515041, Guangdong, China
| | - Peishan Chen
- Department of Obstetrics, Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
| | - Yuejun Huang
- Department of Neonatology, Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
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15
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Decker AN, Fischer AR, Gunn HE. Socio-Ecological Context of Sleep: Gender Differences and Couples' Relationships as Exemplars. Curr Psychiatry Rep 2022; 24:831-840. [PMID: 36401678 PMCID: PMC9676909 DOI: 10.1007/s11920-022-01393-6] [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] [Accepted: 10/28/2022] [Indexed: 11/21/2022]
Abstract
PURPOSE OF REVIEW We summarized recent findings on insufficient sleep and insomnia, two prominent sleep issues that impact public health. We demonstrate the socio-ecologial impact of sleep health with findings on gender and couples' relationships as exemplars. RECENT FINDINGS Robust gender differences in sleep duration and insomnia are due to biological and socio-ecological factors. Gender differences in insufficient sleep vary by country of origin and age whereas gender differences in insomnia reflect minoritized identities (e.g., sexual, gender). Co-sleeping with a partner is associated with longer sleep and more awakenings. Gender differences and couples' sleep were affected by intersecting social and societal influences, which supports a socio-ecological approach to sleep. Recent and seminal contributions to sleep health highlight the importance of observing individual sleep outcomes in a socio-ecological context. Novel methodology, such as global measures of sleep health, can inform efforts to improve sleep and, ultimately, public health.
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Affiliation(s)
- Andrea N. Decker
- Department of Psychology, The University of Alabama, 505 Hackberry Lane, Tuscaloosa, AL 35401 USA
| | - Alexandra R. Fischer
- Department of Psychology, The University of Alabama, 505 Hackberry Lane, Tuscaloosa, AL 35401 USA
| | - Heather E. Gunn
- Department of Psychology, The University of Alabama, 505 Hackberry Lane, Tuscaloosa, AL 35401 USA
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16
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Fischer AR, Green SRM, Gunn HE. Social-ecological considerations for the sleep health of rural mothers. J Behav Med 2021; 44:507-518. [PMID: 33083923 PMCID: PMC7574991 DOI: 10.1007/s10865-020-00189-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 09/30/2020] [Indexed: 02/03/2023]
Abstract
Using a social-ecological framework, we identify social determinants that interact to influence sleep health, identify gaps in the literature, and make recommendations for targeting sleep health in rural mothers. Rural mothers experience unique challenges and protective factors in maintaining adequate sleep health during the postpartum and early maternal years. Geographic isolation, barriers to comprehensive behavioral medicine services, and intra-rural ethno-racial disparities are discussed at the societal (e.g., public policy), social (e.g., community) and individual levels (e.g., stress) of the social-ecological model. Research on sleep health would benefit from attention to methodological considerations of factors affecting rural mothers such as including parity in population-level analyses or applying community-based participatory research principles. Future sleep health programs would benefit from using existing social support networks to disseminate sleep health information, integrating behavioral health services into clinical care frameworks, and tailoring culturally-appropriate Telehealth/mHealth programs to enhance the sleep health of rural mothers.
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Affiliation(s)
- Alexandra R Fischer
- Department of Psychology, University of Alabama, Box 87034, Tuscaloosa, AL, 35487, USA
| | | | - Heather E Gunn
- Department of Psychology, University of Alabama, Box 87034, Tuscaloosa, AL, 35487, USA.
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17
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Emond JA, O'Malley AJ, Neelon B, Kravitz RM, Ostbye T, Benjamin-Neelon SE. Associations between daily screen time and sleep in a racially and socioeconomically diverse sample of US infants: a prospective cohort study. BMJ Open 2021; 11:e044525. [PMID: 34168024 PMCID: PMC8231048 DOI: 10.1136/bmjopen-2020-044525] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
OBJECTIVE To determine the associations between screen media use and sleep throughout infancy (3-12 months). DESIGN Prospective Nurture birth cohort. SETTING North Carolina, USA, 2013-2015. PARTICIPANTS Women enrolled in their second to third trimester, completed a phone interview after birth, and completed home visits at 3, 6, 9 and 12 months post partum. PRIMARY AND SECONDARY OUTCOME MEASURES Women reported the usual hours their infants slept during the day and night and their infants' usual use of five screen media activities at 3, 6, 9 and 12 months post partum. Adjusted mixed-effects regression analyses modelled the associations between infant screen time and sleep outcomes while disaggregating the between-infant and within-infant effects. RESULTS Among 558 mother-infant dyads, 374 (67.0%) infants were black and 304 (54.5%) households earned <$20 000 per year. Half (254, 50.2%) of the infants engaged with screens at 3 months of age, while 326 (72.9%) engaged at 12 months. The median value of the average daily screen time over the study period was 50 (IQR: 10-141) min. Infant screen time was inversely associated with night-time sleep duration only when considering between-infant effects (adjusted beta: -2.9; 95% CI -5.9 to 0.0; p=0.054 for log-transformed screen time). Effects were stronger for television+DVD viewing specifically (adjusted beta: -5.2; 95% CI -9.1 to -1.4; p<0.01 for log-transformed television+DVD time). For example, an infant who averaged 1 hour of television+DVD viewing over the study period slept, on average, 9.20 (95% CI 9.02 to 9.37) hours per night by 12 months compared with 9.60 (95% CI 9.41 to 9.80) hours per night for an infant with no screen time over the study period. There were no significant within-infant effects between screen time and night-time sleep, and screen time was not associated with daytime sleep or night-time awakenings. CONCLUSIONS Screen time during infancy was inversely associated with night-time sleep duration; however, causal associations remain uncertain. TRIAL REGISTRATION NUMBER NCT01788644.
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Affiliation(s)
- Jennifer A Emond
- Department of Biomedical Data Science, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
| | - A James O'Malley
- Department of Biomedical Data Science, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- The Dartmouth Institute, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
| | - Brian Neelon
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Richard M Kravitz
- Division of Pediatric Pulmonary and Sleep Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Truls Ostbye
- Department of Family Medicine and Community Health, Duke University, Durham, North Carolina, USA
| | - Sara E Benjamin-Neelon
- Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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