Light-Based Chronotherapy Advances Circadian Timing, Extends Sleep in Late-Sleeping Adolescents

A 2-week multicomponent chronotherapeutic intervention, combining personalized sleep scheduling, morning bright-light glasses, and evening blue light–blocking glasses, significantly shifted circadian timing earlier and extended weeknight sleep duration in late-sleeping adolescents, according to a randomized clinical trial published in JAMA Pediatrics.¹

The findings address a pressing public health concern: roughly 80% of US adolescents get insufficient sleep.² Biologically-driven delays in sleep initiation, combined with early school start times, chronically truncate adolescent sleep. Weekend catch-up sleeping worsens circadian misalignment, a mismatch between internal biological timing and imposed sleep-wake schedules, which has been linked to depression, cardiometabolic risk, impaired cognition, risk-taking, and academic underperformance.

Inside the Sleeping Late Teens Program

The trial enrolled 86 participants aged 16 to 19 years with habitual weekend bedtimes later than 1:00 AM.¹ Of 80 who completed baseline procedures, the mean age was 17.5 years, and 60% were female. Intervention participants (n = 40) attended a single ~1-hour collaborative session to develop a personalized sleep schedule targeting earlier bedtimes and consistent rise times. For 2 weeks, they wore morning bright-light glasses for 30 to 60 minutes upon waking and amber-tinted blue light–blocking glasses for 2 hours before bed. Bedtimes were set 1.5 hours earlier than habitual, with weekend wake times restricted to within 1 hour of weekday times. Control participants (n = 40) received no guidance.

Primary outcomes were circadian timing via salivary dim-light melatonin onset (DLMO), weeknight sleep duration by actigraphy, and circadian alignment (DLMO-to-midsleep interval). Analyses were intention-to-treat, with Bonferroni-corrected significance at P = .017.

Meaningful Gains in Timing and Duration

Intervention participants advanced their DLMO by 36 minutes while controls shifted 9 minutes later—a significant between-group difference of 45 minutes (β = −0.55; 95% CI, −0.79 to −0.31; P = .003). Earlier circadian timing means more of the school day aligns with peak biological alertness, with potential benefits for academic performance and drowsy driving risk.

Weeknight sleep extended by 47 minutes in the intervention group vs controls (β = 0.74; 95% CI, 0.30–1.18; P = .003), with mean duration rising from 6.48 to 7.27 hours. Weekend sleep shortened by approximately 1 hour, yielding a net gain of about 16 minutes per night across the full week.

The DLMO-to-midsleep interval shortened by 18 minutes in the intervention group versus an 8-minute lengthening in controls, but this difference was not statistically significant (P = .20). Sleep regularity improved, and morning alertness ratings increased in the intervention group. Sleep continuity, however, remained unchanged in both groups.

Participants used blue light–blocking glasses on 68% of nights and bright-light glasses on 79% of mornings. Overall program satisfaction averaged 7.6 out of 10.

“Results show that a short-term nonpharmacological intervention was sufficient to change adolescent behaviors and circadian timing, underscoring the potential for multicomponent interventions to improve adolescent sleep and circadian health,” the authors wrote.

What This Means for Practice

They highlighted several of their study’s limitations, including that the sample was predominantly White and non-Hispanic, limiting generalizability. Also, device costs may pose barriers to access. However, the authors suggested natural light and screen filters as lower-cost alternatives.

Building on their findings, they called for larger effectiveness trials to examine the intervention’s downstream effects on mental health, academic performance, and risk behaviors.

“Integrating personalized solutions with policy changes is most likely to lead to meaningful changes for adolescent sleep and circadian health,” the authors concluded.

References

1. Wescott DL, Quick AD, Oryshkewych NS, et al. Chronotherapeutic approaches to target insufficient and late sleep in adolescents: a randomized clinical trial. JAMA Pediatr. Published online April 20, 2026. doi:10.1001/jamapediatrics.2026.0976
2. National Sleep Foundation. Sleep in America Poll 2024. Accessed April 27, 2026. https://www.thensf.org/wp-content/uploads/2025/07/NSF-Sleep-in-America-2024-Report_final.pdf