Sleep coaching lengthened teenagers' sleep without correcting late sleep timing
Longer sleep persisted at follow-up in the coaching group, but none of the tested approaches overcame late sleep rhythms.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Personalized sleep coaching increased sleep duration compared with an information-only control, and that difference persisted at follow-up. However, the intervention did not resolve adolescents' late sleep rhythms. No improvement in sleep patterns was reported for bright light therapy or the combined approach. The clearest result concerns time asleep rather than earlier timing.
The abstract does not describe the coaching content or give confidence intervals for the sleep-duration differences. It also does not report how many participants completed the later assessment.
What researchers found
Greater increase in sleep duration
Personalized coaching versus information control, from baseline to the 1-year follow-up; reported as statistically significant.
What changed over time
Coaching increased sleep duration both immediately after the intervention and at the later follow-up. Sleep hygiene also improved initially, but that change did not persist, showing that different sleep outcomes followed different trajectories.
Duration and timing differ
The study measured sleep patterns and circadian temperature rhythms as well as questionnaire outcomes. Its findings separate sleeping longer from correcting a delayed sleep schedule; improvement in the former did not establish improvement in the latter.
The original publication
Toward Earlier Bedtimes: Randomized Trial of Multi-Method Interventions in a Community Cohort of Adolescents.
Kuula L, Pesonen AK
J Adolesc Health · 2026
- PubMed ID
- 41697175
- Record checked
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