Overeating is a huge one for me. I want the food at the time but then afterwards I feel awful and gross and like I need a shower.
Staying up really late has never been a problem for me, I always feel fine the next day. Energiser Bunny! :D
Also I'm shocked that nobody has said 'random sex with strangers'. And why can't we talk about drugs? There was a cannabis club in Other Clubs once, if that's OK then I'm sure mentioning drugs is OK here