Improving Sleep Health and Circadian Timing to Support Cardiometabolic Health in Adolescents

Many teenagers get too little and late timed sleep. High body weight and diabetes areincreasing in teenagers as well. This study plans to learn more about whether improvingsleep habits can help improve how the body regulates blood sugar and energy use inteenagers who have higher body weight. To answer this question, the investigators plan toenroll teenagers who get <7 hours of sleep on school nights and measure changes in bloodsugars and energy use after two weeks of typical sleep (sleeping on their normal schoolschedule) and two weeks of a sleep intervention that includes spending longer time in bedat night, melatonin, and morning light.