A 2-week chronotherapy program combining personalized sleep scheduling with morning bright-light glasses and evening blue light–blocking glasses was associated with earlier circadian timing and longer weeknight sleep duration among adolescents with delayed sleep patterns in a randomized clinical trial published in JAMA Pediatrics. Researchers randomly assigned 86 adolescents aged 16 to 19 years to the intervention or a sleep-monitoring control group. The intervention advanced dim-light melatonin onset by 45 minutes relative to controls and increased weeknight sleep duration by 47 minutes, although circadian alignment did not significantly improve. Exploratory findings suggested earlier sleep and wake times, reduced sleep irregularity, and improved morning alertness. The study was limited by its short duration, lack of long-term follow-up, and predominantly White, non-Hispanic sample.

Source: JAMA Pediatrics