2:00 or 3:00 AM - 6:00 AM (three to four hours)
6:20 AM - 7:20 AM transit (one hour)
At least three 10- to 20-minute naps throughout the school day. I negotiated with my teachers to make this acceptable. One pre-lunch nap, one around lunch hours, and one after.
2:20 PM - 3:20 PM transit (one hour)
8:30 PM - 9:30 PM transit or at home (one hour)
I was dual-enrolling at the local college at the time for night classes. I was productive, but it was awful, and I wouldn't recommend it. It became a (benign) running joke at my school that I was more likely to be asleep than awake.
I got 7-8 hours of sleep, but it's nothing compared to sleeping like normal. Any disruption to my schedule was absolutely fatal for my productivity.