Each subject will receive 3mg of melatonin 1 hour prior to bedtime for 12 consecutive nights

Objective sleep will be measured via wrist-worn actigraphy worn nightly for 2 "run-in" nights followed by 12 consecutive nights after receiving melatonin (14 nights/2 weeks total). Changes in objective sleep duration would be demonstrated by either an increase or decrease in number of hours asleep compared to baseline

Objective sleep will be measured via wrist-worn actigraphy worn nightly for 2 "run-in" nights followed by 12 consecutive nights after receiving placebo (14 nights/2 weeks total). No change in objective sleep duration would be demonstrated compared to baseline

The Emotion Regulation Index for Children and Adolescents (ERICA) is a 16-item adolescent-report measure with scores ranging from 16 to 80 (higher scores indicative of better emotion regulation). This measure will be administered during baseline and after 14 days (2 weeks) including a 2 day "run-in" followed by 12 days of melatonin administration. It is expected that emotion regulation will improve after melatonin administration compared to baseline. Normal emotion regulation varies by individual.