Impact of a modest delay in school start time in Hong Kong school adolescents
Publication in refereed journal

Times Cited
Web of Science23WOS source URL (as at 14/01/2021) Click here for the latest count
Altmetrics Information

Other information
To examine the effects of a modest delay (15 min) in school start time (SST) on adolescent sleep patterns, mood, and behaviors.

Two secondary schools in Hong Kong with a total of 1173 students (intervention: n = 617; comparison school n = 556) completed both baseline and follow-up questionnaires. School start time was delayed by 15 min, from 7:45 a.m. to 8:00 a.m., in the intervention school. The comparison school maintained their regular SST at 7:55 a.m. Students' sleep-wake patterns, daytime sleepiness, and mental and behavioral aspects were assessed by validated questionnaires before and after the intervention.

Students in the intervention school significantly delayed their weekday wake-up time (p < 0.001) and increased their total time in bed (p < 0.001) when compared to students in the comparison school. Both groups experienced a delay in their weekday bedtime. The students in the intervention school showed improved mental health [General Health Questionnaire (GHQ) score, p = 0.015], better prosocial behaviors (p = 0.009), better peer relationships (p < 0.001), greater attentiveness (p < 0.001), less emotional problems (p = 0.002), and less behavioral difficulties (p < 0.001) as measured by Strengths and Difficulties Questionnaire (SDQ).

A modest delay (15 min) in school start time can increase adolescent sleep with corresponding improvement in mood and behaviors. Current findings have significant implications for education policy, suggesting that school administrators and policy makers should systematically consider delaying school start time to promote sleep and health among school-aged adolescents.
All Author(s) ListNgan Yin Chan, Jihui Zhang, Mandy Wai Man Yu, Siu Ping Lam, Shirley Xin Li, Alice Pik Shan Kong, Albert Martin Li, Yun Kwok Wing
Journal nameSleep Medicine
Volume Number30
Pages164 - 170
LanguagesEnglish-United States
KeywordsSchool start time, Comparison study, Sleep patterns, Adolescents

Last updated on 2021-15-01 at 00:54