Impact of a modest delay in school start time in Hong Kong school adolescents
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AbstractObjective
To examine the effects of a modest delay (15 min) in school start time (SST) on adolescent sleep patterns, mood, and behaviors.

Methods
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.

Results
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).

Conclusions
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
Year2017
Month2
Volume Number30
Pages164 - 170
ISSN1389-9457
eISSN1878-5506
LanguagesEnglish-United States
KeywordsSchool start time, Comparison study, Sleep patterns, Adolescents

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