In 1998, federal legislation was introduced to offer school districts financial incentives to change school hours to be more in sync with teens' circadian rhythms, but only a few communities did so. The sleep your child is missing matters. Hormones essential to growth and sexual maturation are released during sleep. The old adage that teenagers who don't sleep don't grow has some truth to it. The longer you sleep the better your grades.
Inadequate sleep leads to poor concentration, inability to remember, crankiness, and sluggishness.
It's also a major reason that car accidents are the second leading cause of death in young people. Readjust your child's internal clock by opening curtains and turning on all the lights in the morning. At night, keep lights low. Discourage late night sports practices, workouts, and jobs. Consider removing TVs, computers, phones, and video games from bedrooms, and stop using them at least an hour before bed.