Thanks Grinity,
I actually have that book...Guess I need to read it again. My DD fits the "delayed sleep phase syndrome" described on that link. I understand that people with ADHD don't produce melatonin so the suggested light therapy probably wouldn't be effective in that case. We have melatonin pills - I guess I just need to make sure she takes them regularly (which is hard to monitor because I fall asleep around 9:30pm whether I like it or not and she forgets to take the pills or chooses not to since she likes reading all night!)

Oh, where is the magic fix-it-all-now pill????