It might well be the lights. However, it doesn't happen often and I've been out quite a few times. I think it happened once before as well. It seemed pretty cool to be honest lol, but it was very distracting when trying to go sleep. It's a bit too late to call my friends, so I'll ask tomorrow or something. The only strange thing I find about that is the fact that it happened the next night and not the night I went out....