ConexiantChronotherapy Trial Tests Sleep Timing in Adolescents

⚠️ Small Study / Early Comparative Evidence
A University of Pittsburgh-led RCT enrolled 86 adolescents aged 16 to 19 with habitual weekend sleep onset after 1:00 AM, randomizing them to the Sleeping Late Teens Program or a sleep-monitoring control. The intervention combined collaborative problem-solving, personalized sleep scheduling, morning bright-light glasses, and evening blue light–blocking glasses over 2 weeks.

Clinical Considerations

• Salivary dim-light melatonin onset advanced 45 minutes in the intervention group relative to controls, a primary outcome.
• Weeknight sleep duration increased by 47 minutes versus controls, with mean weekday sleep rising from 6.48 to 7.27 hours in the intervention arm.
• Circadian alignment (DLMO-to-midsleep interval) did not significantly differ between groups, leaving one of three primary outcomes unmet.
• Adherence varied by component, ranging from 63% for earlier bedtimes to 79% for morning bright-light glasses, with no reported adverse events.

Practice Applications

• Consider sleep timing and light exposure counseling for adolescents reporting delayed sleep patterns, even before pharmacologic options.
• Recognize that the intervention shifted timing and duration but did not improve circadian alignment over 2 weeks.
• Interpret findings cautiously given short follow-up, modest sample, predominantly White cohort, and confounding from text reminders, incentives, and staff contact.
• Monitor for lower-cost translation options such as natural daylight exposure, school lighting adjustments, and screen filters as the evidence base matures.