Sustained benefits of delaying school start time on adolescent sleep and well-being

Sleep. 2018 Jun 1;41(6):zsy052. doi: 10.1093/sleep/zsy052.

Abstract

Study objectives: To investigate the short- and longer-term impact of a 45-min delay in school start time on sleep and well-being of adolescents.

Methods: The sample consisted of 375 students in grades 7-10 (mean age ± SD: 14.6 ± 1.15 years) from an all-girls' secondary school in Singapore that delayed its start time from 07:30 to 08:15. Self-reports of sleep timing, sleepiness, and well-being (depressive symptoms and mood) were obtained at baseline prior to the delay, and at approximately 1 and 9 months after the delay. Total sleep time (TST) was evaluated via actigraphy.

Results: After 1 month, bedtimes on school nights were delayed by 9.0 min, while rise times were delayed by 31.6 min, resulting in an increase in time in bed (TIB) of 23.2 min. After 9 months, the increase in TIB was sustained, and TST increased by 10.0 min relative to baseline. Participants also reported lower levels of subjective sleepiness and improvement in well-being at both follow-ups. Notably, greater increase in sleep duration on school nights was associated with greater improvement in alertness and well-being.

Conclusions: Delaying school start time can result in sustained benefits on sleep duration, daytime alertness, and mental well-being even within a culture where trading sleep for academic success is widespread.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adolescent Behavior / physiology*
  • Adolescent Behavior / psychology*
  • Affect / physiology
  • Attention / physiology
  • Depression
  • Female
  • Humans
  • Schools* / standards
  • Self Report
  • Singapore / epidemiology
  • Sleep / physiology*
  • Students / psychology*
  • Time Factors
  • Wakefulness / physiology