I've name changed, because DS knows my MN name.
DS is 17, in his final year at school (Scotland) and has always been a night owl. However his sleeping patterns have been chaotic for the last year or maybe longer. We all go to bed about 11pm, but DS sits in his chair in his room reading till all hours. Sometimes he doesn't go to sleep till 3 or 4am. Then he struggles to get up for school, doesn't have time to sit down for breakfast (breakfast is often a cereal bar eaten on the bus) When he gets home from school he's exhausted and usually sleeps from 4-6pm (I sometimes keep poking him awake, sometimes leave him.) He wakes up for dinner and starts his homework at some point in the evening. He can be doing homework till quite late, though he takes breaks to watch You tube clips etc, which prolongs the whole homework thing. It's hard to tell how much of his time is homework and how much is mucking about on the computer. He's often still doing his homework when DH and I are heading to bed.
He has a "catch-up" on sleep on Sat morning when he sleeps till lunchtime, and sometimes other day time naps over the weekend.
The school has expressed concern about him being tired in class, and he's under-achieving academically. He does no sport or anything to keep fit, because by the time he's at his most awake it's dark and the nearest fitness centre / swimming pool etc is closing.
He knows that the school, DH and I are all worried, and he doesn't like under-achieving academically, but doesn't see a need to change. Two nights ago he fell asleep reading in his chair and didn't go to bed at all - slept the whole night, fully dressed, in his chair.
How can we make him realise that he's mucking up his life by not sorting out his sleep patterns?