People just sort of hang out and try to get themselves a bigger alcohol buzz. The reality is that at some point the party has got to stop. In this way you can be a trooper the next day.
Nothing Interesting Happens After 2 AM
I once read this book that was talking about socialites and how some people manage to have it all. They work hard and productive and go out to all the parties and have fun.
This was their secret – a power socialite would show up for an event but would soon go to another party and after a few such stops head home early. This was what differentiated pros and wannabes. The amateurs would stay up all night and party. The next day however they would be completely burnt out from exhaustion.