I'm traveling back in 4 hours, my classes start in 8. So, I'm calculating whether or not I should get any sleep. Last Sunday I was drinking until 4 (Monday 4 AM - at my friend's; when I finished my last beer I left and that was at 4), traveled back at 5, and then left for classes still drunk and without sleep. This time it should be a piece of cake - but it'll be not as fun, though.