A short-term intervention combining sleep scheduling, morning bright-light glasses, and evening blue light-blocking glasses shifted circadian timing earlier by 45 minutes and extended weeknight sleep duration by 47 minutes in adolescents with late sleep.
Key Findings
Results
Adolescents in the active intervention had significantly earlier circadian timing compared to controls after 2 weeks.
Circadian timing was indexed by salivary dim-light melatonin onset (DLMO)
The intervention group showed earlier DLMO by 45 minutes compared to controls (β = -0.55; 95% CI, -0.79 to -0.31; P = .003)
This difference was described as both statistically significant and clinically relevant
The trial was conducted during school months (late August to mid-June) between 2018 and 2024
Results
Adolescents in the active intervention had significantly longer weeknight sleep duration compared to controls after 2 weeks.
Sleep duration was measured with actigraphy
The intervention group had 47 minutes longer weeknight sleep duration compared to controls (β = 0.74; 95% CI, 0.30-1.18; P = .003)
This difference was described as both statistically significant and clinically relevant
Participants were eligible if they reported habitual weekend sleep onset later than 1 am
Results
The intervention did not produce a statistically significant improvement in circadian alignment (DLMO-midsleep interval) compared to controls.
Circadian alignment was operationalized as the interval between DLMO and midsleep (middle of the nocturnal sleep period)
DLMO-midsleep alignment shortened by 18 minutes in the intervention group compared with an 8-minute lengthening in controls
This difference was not statistically significant (β = -0.35; 95% CI, -0.72 to 0.02; P = .20)
Methods
The Sleeping Late Teens Program was a brief, multi-component chronotherapeutic intervention delivered over 2 weeks.
The intervention included 1 collaborative, problem-solving session of less than 1 hour
Participants followed a personalized sleep schedule that shifted bedtimes and wake times earlier for 2 weeks
Participants wore morning bright-light glasses for 30 to 60 minutes upon waking
Participants wore amber-tinted blue light-blocking glasses for 2 hours before bed
Methods
The study enrolled 86 adolescents aged 16 to 19 years with late sleep, with 80 completing baseline procedures.
44 participants were randomly assigned to the intervention group and 42 to the control group
80 participants completed baseline procedures (40 in each group)
Mean (SD) age was 17.5 (0.7) years; 48 were female (60%) and 32 were male (40%)
All analyses were intention to treat
Participants were enrolled in a traditional high school
What This Means
This research suggests that a simple, short-term program combining sleep scheduling with light-based tools can meaningfully improve sleep in teenagers who tend to stay up late. The program — called the Sleeping Late Teens Program — involved a single problem-solving session with a researcher, a personalized schedule to shift bedtimes and wake times earlier, wearing special bright-light glasses in the morning for up to an hour, and wearing blue-light blocking amber glasses for two hours before bed. After just two weeks, teenagers who followed this program fell asleep about 45 minutes earlier (based on a biological marker of the body clock called dim-light melatonin onset) and slept about 47 minutes longer on school nights compared to teenagers who only monitored their sleep.
The study is notable because it targeted a very common problem — many teenagers have body clocks that are naturally shifted later, which conflicts with early school start times and leads to chronic sleep deprivation. The intervention was brief and practical, requiring less than an hour of one-on-one guidance, and used wearable light devices rather than medications. While the improvement in the alignment between the body clock and actual sleep timing did not reach statistical significance, the shifts in both biological clock timing and actual sleep duration were considered both statistically and clinically meaningful.
This research suggests that combining behavioral sleep scheduling with morning light exposure and evening blue-light blocking could be a feasible, low-burden approach to address late and insufficient sleep in adolescents. The authors note that larger trials are needed to confirm these findings and assess longer-term effects. The results are particularly relevant given the widespread concern about adolescent sleep deprivation and its links to mental and physical health.
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Wescott D, Quick A, Oryshkewych N, Wallace M, Beebe D, Buysse D, et al.. (2026). Chronotherapeutic Approaches to Target Insufficient and Late Sleep in Adolescents: A Randomized Clinical Trial.. JAMA pediatrics. https://doi.org/10.1001/jamapediatrics.2026.0976