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Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
Published on: April 7, 2020
Sleep behavior in an urban US sample of school-aged children
James C Spilsbury1, Amy Storfer-Isser, Dennis Drotar
1Department of Pediatrics, Division of Behavioral Pediatrics and Psychology, Rainbow Babies & Children's Hospital, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106-6038, USA. jcs5@po.cwru.edu
Insights
Elementary school children, especially minority boys, experience insufficient sleep, with delayed bedtimes contributing to sleep restriction. Understanding ethnic disparities in sleep patterns is crucial for intervention.
Area of Science:
- Pediatric Sleep Science
- Child Health and Development
- Sociodemographic Influences on Sleep
Background:
- Adequate sleep is vital for elementary school-aged children's health and development.
- Previous research indicates potential variations in sleep duration and patterns among children.
- Understanding these variations is essential for identifying at-risk populations.
Purpose of the Study:
- To characterize the sleep behavior of elementary school-aged children.
- To investigate how sleep patterns vary by age, sex, and ethnicity.
- To identify factors associated with insufficient sleep in this demographic.
Main Methods:
- Cross-sectional analysis of 755 children aged 8-11 years.
- Data collected via child-completed sleep journals and caregiver questionnaires.
- Key metrics included mean nightly sleep duration and bedtime adherence.
Main Results:
- Overall mean sleep duration was 9.63 hours, with significant decreases associated with older age and male sex.
- Minority boys exhibited the shortest sleep duration and were more likely to have later bedtimes (≥11 pm).
- Forty-three percent of older minority boys slept less than 9 hours nightly, compared to other subgroups.
Conclusions:
- A significant portion of elementary schoolchildren experience insufficient sleep (<9 hours).
- Emerging sleep restriction is evident in preadolescents, particularly ethnic minorities, with delayed bedtimes.
- Ethnic differences in sleep behavior necessitate further research into social and environmental influences.
Objectives:
To describe sleep behavior of elementary school-aged children and to assess variations by age, sex, and ethnicity.
Design, Setting, And Participants:
Cross-sectional analysis of 755 (50% female, 35% ethnic minority) children 8 to 11 years old from a community-based sample of children participating in a cohort study. Sleep and health data were obtained from a child-completed 7-day sleep journal and a caregiver-completed health/sleep questionnaire.
Main Outcome Measure:
Mean nightly sleep duration; bedtime 11 pm or later.
Results:
Mean (SD) sleep duration for all children was 9.63 (0.72) hours. Univariate results showed a statistically significant decrease in mean sleep duration associated with increasing age (P < .001) and male sex (P = .03). At all ages, minority boys slept significantly less than nonminority boys and girls and minority girls. The shortest covariate-adjusted mean sleep duration was observed among the oldest minority boys (9.28 [0.07] hours vs 9.43-9.85 hours in the other age, sex, and ethnicity subgroups). Forty-three percent of 10- to 11-year-old minority boys reported less than 9 hours nightly sleep vs 5% to 26% of the other age, sex, and ethnicity subgroups. After controlling for potential confounding, minority children were more likely than nonminority children to have a bedtime of 11 pm or later (odds ratio, 4.8; 95% confidence interval, 2.9-8.0).
Conclusions:
A sizeable proportion of elementary schoolchildren sleep less than the recommended 9 hours. Across the age range, decreases in sleep time and, in ethnic minorities, increasingly delayed bedtimes suggest emerging sleep restriction in preadolescents. Observed ethnic differences in sleep behavior highlight the need for better understanding of the social and environmental influences encouraging these sleep patterns.
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