Yes, I do. Mostly because people do sweat in their sleep. It doesn't really seem like it because when you wake up you are not all wet. Especially if you sleep a lot like I do, you're prone to niht sweats. It also depends on your rate of perspiration. I will admit that my underarms are pretty bad, so I should put on deoderant often.

Also, not many people know this, but you shouldn't apply deoderant if you already have some on. It doesn't just wear off. You should wipe off the deoderant you had on before you apply more, even if you don't take a shower.