Two things that I found really helped me in nursing school
#1: I would take a 1-2 hour nap right when I got home from school. That way when I woke up, I was refreshed and ready to work. If you're not the type that can take a nap and then sleep well that night, at least spend this time doing something relaxing. That way you're ready to focus on what needs to be done.
#2: Don't procrastinate!!! If your body cuts off at 10:30, then there's really nothing you can do to change that. But if you don't procrastinate on getting your work done, then you know that if it's 10:30 and you're worn out, you can sleep easy because you still have the next day to finish what you're working on.
I don't know whether you're a morning person, but my friends and I would get a good nights sleep and then meet early in the morning over breakfast to study or reveiw, etc. Worked like a charm!