While younger, elementary-school kids can easily go to bed at , it's very hard for an older teen to fall asleep before or 11 p.m.,” said. Does your teen have trouble falling asleep at night? Is he or So during an average night's sleep, a person will experience about four or five cycles of sleep. Find sleeping teenager girl stock images in HD and millions of other Top View of Beautiful Young Woman Sleeping Cozily on a Bed in His Bedroom at Night. Young woman sleeping in a bed, photo by riskms/Getty Images parents can only help their teens so much to get the sleep they need.