My computer keeps turning itself on at random times.

I have no idea why its happening. Some nights it turns itself on every 30-50 minutes, some nights not at all, and some nights it will just turn itself on once. It never does it before midnight though. I have absolutely no idea why it is doing it. I checked the energy save scheduler and it doesn't have anything in it. I also disabled all the wake upon stuff. Including the restart in case of power failure. This is really starting to boggle my mind. I've started just pulling the chord out of the machine every night. I really don't know what to do. I've tried hitting the death button and resetting the pram. Anyone have any other ideas?

BTW i have a UPS hooked up to the machine also.