My teenage daughter is tired every morning even after 14 hrs and takes naps after that much sleep. has no illness but stays up late & gets up late?

Change sleep pattern: Your daughter needs to change her time of sleep .She may not be actually sleeping enough and feels tired .She may start going to sleep by 8-9 p.m.and get up at 6-7 a.m.so she gets9-10 hours sleep ,then she will feel fresh . Make it sure T.V.is off in her room and may have to cut down telephone talk late at night.She may have little nap if she wants.