- Researchers randomized 86 adolescents with habitual late sleep patterns to a 2-week chronotherapy intervention or sleep-monitoring control group.
- The intervention combined personalized earlier sleep scheduling with morning bright-light glasses and evening blue light–blocking glasses.
- Circadian timing shifted 45 minutes earlier relative to controls, based on dim-light melatonin onset measurements.
- Weeknight sleep duration increased by 47 minutes in the intervention group, rising from 6.48 to 7.27 hours on average.
- Circadian alignment, measured as the interval between dim-light melatonin onset and midsleep, did not significantly improve.
- Exploratory findings showed earlier sleep and wake times, reduced weekday-to-weekend sleep irregularity, and improved morning alertness.
- Researchers noted limitations including the short 2-week duration, lack of long-term follow-up, and limited demographic diversity.
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