I agree with Fenway on being direct with coaches, you have to ask (and this is one of the few times I asked specific questions to coaches) "what do you do when a student/.athlete has a lab class scheduled at the same time as a practice". As an example of the two answers you get Coach Stotz at Stanford was direct and said "no problem we have kids coming and going all of the time, look at our roster and their majors, we work around it" Another one start out saying "well you know...." when you get "well you know" be careful.
Fenway mentioned something above that struck me as similar with my son, he pretty much went to bed every night at 3AM also. This is a problem for teams with early morning mandatory workouts, my son always gets his work in typically between 12-3 before practice. Some kids who are allowed to work out on their own are lazy and don't do it but the ones who are dedicated (and usually playing) are the ones who always get it done no matter the circumstances.
Hope this helps.