I've heard of staying up all night or as late as 5 am or so, but seems like that might be a waste of day time? >.<
Well, what times do you tend to (or plan to) be awake during Fanime?
I'll sleep between 12-1 to about 5:30 it is worth getting full nights sleep and you don't miss much.
Bottom line people need to sleep! I catch you in zombie trance from staying up all night, I'll roundhouse kick you.