Calling it a night at 9:39 on Saturday? There should be a law against that.
I've been there twice and never been to bed before 2:00a.m. on any of the nights... latest was just before 5:00 on Sunday morning in '08. Some of the early-risers were starting to come out to get their cars ready for the trip home when I decided to go to bed... good thing about the heat, you can sweat-out a hangover real quick.