Sleep study

Studies link sleep deficits, student performance
Sleep-deprived students fare far worse academically and emotionally than students who get adequate sleep. MRI scans show that a lack of sleep inhibits the body's ability to refuel itself. Some districts have tried to encourage students to get more sleep by starting school later in the morning.
Bronson, P. (2007, Oct. 15). Snooze or lose. New York Magazine