title: Sleep duration or bedtime? Exploring the relationship between sleep habits and weight status and activity patterns.
abstract: OBJECTIVE
  To assess the effects of early and late bedtimes and wake up times on use of time and weight status in Australian school-aged children.
  
  
  METHODS
  Observational cross-sectional study involving use of time interviews and pedometers.
  
  
  METHODS
  Free-living Australian adolescents.
  
  
  METHODS
  2200 9- to 16-year-olds from all states of Australia
  
  
  METHODS
  NA.
  
  
  RESULTS
  Bedtimes and wake times were adjusted for age and sex and classified as early or late using median splits. Adolescents were allocated into 4 sleep-wake pattern groups: Early-bed/Early-rise; Early-bed/Late-rise; Late-bed/Early-rise; Late-bed/Late-rise. The groups were compared for use of time (screen time, physical activity, and study-related time), sociodemographic characteristics, and weight status. Adolescents in the Late-bed/Late-rise category experienced 48 min/d more screen time and 27 min less moderate-to-vigorous physical activity (MVPA) (P<0.0001) than adolescents in the Early-bed/Early-rise category, in spite of similar sleep durations. Late-bed/Late-rise adolescents had a higher BMI z-score (0.66 vs. 0.45, P=0.0015). Late-bed/Late-rise adolescents were 1.47 times more likely to be overweight or obese than Early-bed/Early-rise adolescents, 2.16 times more likely to be obese, 1.77 times more likely to have low MVPA, and 2.92 times more likely to have high screen time. Late-bed/Late-rise adolescents were more likely to come from poorer households, to live in major cities, and have fewer siblings.
  
  
  CONCLUSIONS
  Late bedtimes and late wake up times are associated with an unfavorable activity and weight status profile, independent of age, sex, household income, geographical remoteness, and sleep duration.
authors.affiliation: Health and Use of Time (HUT) Group, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia.
authors.forename: Tim S
authors.initials: TS
authors.lastname: Olds
authors.forename: Carol A
authors.initials: CA
authors.lastname: Maher
authors.forename: Lisa
authors.initials: L
authors.lastname: Matricciani
mesh_terms: D000293:Adolescent; D001315:Australia; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D009043:Motor Activity / Q000502:physiology; D057185:Sedentary Behavior; D012890:Sleep / Q000502:physiology; D012959:Socioeconomic Factors