Just to cover all the bases, have your child do a sleep study. Especially if they're still on your insurance and it covers such things, as it can be somewhat expensive otherwise (in the US.)
Sleep disorders really compound other problems, and they'll be pretty thankful later in life to have caught any disorders early before they've done a lot of damage.
I will suggest that but as far as we both can tell he wakes when he has had enough sleep but keeps staying up late on phone or procrastinating or like driving home from meeting friends after getting off work at midnight.
Sleep disorders really compound other problems, and they'll be pretty thankful later in life to have caught any disorders early before they've done a lot of damage.