I'm also a night owl. I generally take like 16 to 20 units. I just try to take classes that are later in the day if possible, so I wake up at like 10am-11am, finish class at 3pm-6pm and then do my homework and stuff after that.

I actually had a terrible nightmare about this last night because I'm signed up for an 8am right now (my classes haven't started yet) and I don't think I can wake up that early, so I think I'm going to drop the class and take a different one that is later in the day.