Cited by 414Sleep and related disordersSleep and Wakefulness ResearchCircadian rhythm and melatonin

Short sleep duration in middle childhood: risk factors and consequences

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Nixon, Gillian M., Thompson, John M. D., Han, Dug Yeo, Becroft, David M., Clark, Phillipa M., Robinson, Elizabeth, Waldie, Karen E., Wild, Chris J. +2 more·2008·SLEEP

Abstract

STUDY OBJECTIVES: To measure sleep duration in 7-year-old children; identify the determinants of sleep duration; and assess the association between short sleep duration and obesity, cognitive functioning, and behaviour. DESIGN: Longitudinal study with disproportionate sampling of the participants. SETTING: Community. PARTICIPANTS: 591 seven-year-old children, of whom 519 had complete sleep data. INTERVENTIONS: Not applicable. MEASUREMENTS: Sleep duration was assessed by actigraphy. Other measurements included height, weight, BMI, percentage body fat as assessed by bioimpedance assay, intelligence (WISC-III) and behaviour (Strengths & Difficulties questionnaire, parent and teachers Conners Rating Scales). RESULTS: Mean time in bed according to parental report was 10.9 hours (SD 0.8). Mean sleep duration by actigraphy was 10.1 (SD 0.8) hours. In multivariable analysis, sleep duration was longer on weekdays vs. weekend nights (31.5 min, P = 0.002), in winter (40.5 min), autumn (31.1 min), and spring (14.8 min) compared with summer (P <0.0001), and in those with younger siblings (11.7 min, P = 0.03). Sleep duration was shorter when bedtime was after 21:00 (-41.1 min, P <0.0001). In multivariable analysis, sleep duration <9 hours was associated with being overweight/ obese (BMI: OR = 3.32; 95% CI = 1.40, 7.87) with an increase of 3.34% body fat (P = 0.03), and this was not explained by physical activity or television watching. Short sleep duration was also associated with higher emotional lability scores (Conners Rating Scale Parent Form; P = 0.03). IQ (WISC-III) and attention deficit / hyperactivity disorder scores (both parent and teachers Conners Rating Scales) did not differ with sleep duration. CONCLUSIONS: Sleep duration in 7-year-old children varies considerably among individuals. The duration is affected by weekday, season, and having younger siblings. Importantly, short sleep duration was shown to be an independent risk factor for obesity/overweight.

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Research works printed but not linked: 2

  1. Elley WB, Irving JC. Revised socioeconomic index for New Zea- land. NZ J Educ Stud 1976;11:25-30.
  2. Wechsler D. WISC-III: Wechsler Intelligence Scale for Children- Third Edition: Manual. San Antonio: Harcourt Brace & Compa- ny; 1992.

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Authors
Nixon, G. M., Thompson, J. M. D., Han, D. Y., Becroft, D. M., Clark, P. M., Robinson, E., Waldie, K. E., Wild, C. J., Black, P. N., & Mitchell, E. A.
Affiliations
  • Monash University (AU)
  • University of Auckland (NZ)
Venue
SLEEP
Published
2008-01
Volume
31
Issue
1
Pages
71-78
ISSN
  • 0161-8105 (ISSN-L)
  • 1550-9109
OpenAlex
W1537660436
Cited by
414
References
54
Citations by year
2026: 5 · 2025: 9 · 2024: 8 · 2023: 8 · 2022: 10 · 2021: 27 · 2020: 22 · 2019: 24 · 2018: 17 · 2017: 22 · 2016: 31 · 2015: 32 · 2014: 24 · 2013: 44 · 2012: 30
FWCI
45.90
Type
journal article
Language
en
Open access
Locations
  • SLEEP (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • ResearchSpace (University of Auckland) (submittedVersion)
Funders
Health Research Council of New Zealand
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
Keywords
short sleep duration, middle childhood, children, bedtime timing, younger siblings, childhood obesity, overweight, fat mass, cognitive function, IQ, emotional lability, attention deficit hyperactivity disorder, behavioral problems
MeSH terms
Activity Cycles, Australia, Body Constitution, Child, Child Behavior, Cognition Disorders, Female, Humans, Male, Obesity, Risk Factors, Seasons, Sleep Deprivation, Comorbidity, Causality, Body Mass Index, Multivariate Analysis, Sleep Disorders, Circadian Rhythm

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