I usually go to the bathroom, I drink water and like something. Of course sometimes I need to go 5 minutes longer, I try to break when this pause occurs to enjoy the time and spend less time without playing
Poker can be mentally exhausting. Even when you dont think it is effecting you, it is. This five minutes is very valuable. You should be doing anything possible to relax and free your mind. Some people play cash games during these breaks, but it often will have a negative effect on lengthy tournaments.