Just like you do in the game Grand Theft Auto. You take a short nap, 6 hours or so. So daytime can be can become nighttime, and vice-versa. You do this because you have got nothing better to do, and you want to kill time so you can do something like party later that night.
Friend: So what are you doing tonight?
You: I'm going to go party!
Friend: Me too!
You: Speaking of that, I'm going to go take a GTA Nap.
Friend: Alright man, talk to you later...