Caffeine, although I've mostly been on top of that recently.
Pr0n, I know what Ashmo means (a little), I find myself collecting it. Usually it goes straight onto the HDD without me even "viewing" it.
Oh, and I have a little OCD.
I have to make sure my hands are clean (front and back), count my fingers (again, front and back, I don't know why) and count any chair arms and/or flat surfaces in the room.
Sometimes I have to do this over and over again. I don't know why, but it keeps me awake sometimes.
Oh, and I often feel the need to make *sneeuuumm* noises whilst doing this (y'know, like a light sabre) or sometimes humming or clicking sounds.
No, I don't know why.
And I've not sought psychiatric help either.
Wait, was that too much again?