Hi, im aware its normal for teenagers to sleep a lot but my 17 yr old son sleeps all night and then is impossible to wake it the day, hes missing meals due to being asleep, when i try and wake him up he says hes awake then he goes straight back off to sleeplike he hasnt slept in days, when he is finally awake 3pm onwards hes lethargic and like hes not really with it, he doesnt drink alcohol, smoke or take drugs, he doesnt leave the house either, we are on the waiting list for a possible autism assessment, even as a child he wasnt energetic and i never had a problem with him going to bed. Doctors tested fir thyroid problems but keep fobbing me off when i say somethings not right, hes tall and thin, i dont know what to do.