for my school, we have/had mandatory attendance for EVERY class. Medical genetics, clinical skills, anatomy, you name it... What i would do is wake up every day at 7:15am regardless of when my first class was including the weekends.
For example; my monday schedule was anatomy 11a-2p, then anatomy lab 5-8 (which rarely went above 6:45p), i would study 8:15-10:30am then study 3-4pm, then from 8pm-11:15 pm, 6 hours of work time.
Tl;dr; follow a strict sleep/wake cycle; you'll be more productive