Since updating to Windows 8.1, my computer has picked up an odd habit when it goes to sleep. I put it to sleep (S3) as usual. Then, 10 minutes later (not roughly, I timed it several times, 10 minutes) it will wake back up momentarily. The display doesn't come back on. Judging from my LED light, I get the impression that it's writing a hibernation file onto my hardisk. Then it goes back to sleep.
Waking the computer back up after it does this is more time consuming than usual. It's usually a 2-3 second process, now it's upward of 12-14 seconds. Waking the computer back up before it does this gives me the normal result.
Now, I've never used hibernation or hybrid sleep modes, I don't know if this is how they typically work or not. I have gone through and made sure all of these modes are disabled in every way that I know how to. I have even gone to the BIOS and disabled Hibernation all together and it still does this. It's either not doing what I think it's doing or it's somehow become stuck on doing it.
I don't have any scheduled task telling it to do anything like this either.