ArticleSleep2018
Sustained benefits of delaying school start time on adolescent sleep and well-being.
Article in Sleep, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT05483296 (Modulating Evening Responses to Light by Afternoon Light Exposure in Adolescents), which is not on this map. Cited by 43 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Modulating Evening Responses to Light by Afternoon Light Exposure in Adolescents
Who cites it
43 citing papers in PubMed, 114 citations in OpenAlex.
- A one-hour delayed school start improves sleep, sleepiness and inhibitory control in early adolescents in a randomized controlled trial.Scientific reports · 2026Trial
- Association between dim light melatonin onset predicted from gene expression profiles with sleep time and chronotype preference: A pilot study.Chronobiology international · 2025Trial
- Advancing adolescent bedtime by motivational interviewing and text message: a randomized controlled trial.Journal of child psychology and psychiatry, and allied disciplines · 2025Trial
- Trial
- Trial
- Challenges in implementing and assessing outcomes of school start time change in the UK: experience of the Oxford Teensleep study.Sleep medicine · 2019Trial
- Sleep Is Integral to School Health and Adolescent Wellbeing: An Evidence-Based Call to Action.The Journal of school health · 2026Review
- Poor sleep health is associated with worse cardiometabolic risk among rural and urban schooled Nigerian adolescents.Scientific reports · 2025Article
- Factors associated with late bedtimes, early wake-up times, and short sleep in adolescents on school nights.Sleep advances : a journal of the Sleep Research Society · 2025Article
- Epidemiology of sleep patterns and circadian typology in uruguayan children: The contribution of school shifts.Sleep medicine: X · 2024Article
- Sleep Hygiene Intervention Improves Sleep Time and Duration in High School Students.Sleep science (Sao Paulo, Brazil) · 2024Article
- Do later school start times improve adolescents' sleep and substance use? A quasi-experimental study.Preventive medicine · 2024Article
- Sleep and mental health among Chinese adolescents: the chain-mediating role of physical health perception and school adjustment.BMC psychology · 2024Article
- Substituting Book Reading for Screen Time Benefits Preschoolers' Sleep Health: Results from the Ulm SPATZ Health Study.Nature and science of sleep · 2024Article
- Construction of a model for adolescent physical and mental health promotion based on the multiple mediating effects of general self-efficacy and sleep duration.BMC public health · 2023Article
- Earlier Bedtime and Its Effect on Adolescent Sleep Duration.Pediatrics · 2023Article
- School-Based Sleep Education Program for Children: A Cluster Randomized Controlled Trial.Healthcare (Basel, Switzerland) · 2023Article
- A better alignment between chronotype and school timing is associated with lower grade retention in adolescents.NPJ science of learning · 2023Article
- Attachment to Mother and Father, Sleep, and Well-Being in Late Middle Childhood.International journal of environmental research and public health · 2023Article
- Are We Ready to Implement Circadian Hygiene Interventions and Programs?International journal of environmental research and public health · 2022Article
Corrections and comments
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Authors and funding
9 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
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.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.