danny phr ewin is associate director of sleep medicine at children's national hea system in d.c. he said it's not how long your children arey're going bed. arning,:hildren's national o ab is part of aup about to optimal times based on a child's age. it builds off recommendations that many parents already use from the american academy of pediatrics. it calls for babies to sleep from 6:00 p.m. to 6:00 a.m. with several additional hours factored in for naps.er should 1 once kidsar school, try bed should avoid taking naps. 8 to 12-year-olds may not be ready until 8:00. teenagers aren't wired to go to sleep until 9:30 and 10 colon 30, aiming for 8 to 10 hours of sleep each night. the doctor says the key is consistency. even on weeken and the summer, or it can lead to social jet ee by three or more hours, it's like they're living in california on the weekend and theckhave to come pa to the east coast for school mond appetite and trouble concentrating. >> our metabolism isn'tale. functioning optly. lew okay to let teenagers sleep inormal nwe america has an education problem. the old sys