The investigators are developing and testing a feasible behavioral intervention to increase school-night sleep duration by shifting the circadian system earlier and providing a time management plan for after-school activities in youngsters between 14 and 17 years and enrolled in high school. This study tests morning bright light and a school-night time management plan to facilitate earlier bedtimes to increase sleep duration. Circadian phase, sleep, neurobehavioral functioning and mood are measured before and immediately after the 2-week intervention and compared to a control group. Long-term effectiveness, adherence, and acceptability are also examined in a 3-week extension study. These data will provide evidence-based treatment strategies for delayed and sleep-restricted adolescents, and acceptability of and adherence to the treatment in this age group.
