I just noticed, my Asus P8Z77-V will resume from sleep all by itself without any intervention. I put it to sleep (Start > Sleep) then after a few seconds, it resumes. I don't know what's causing this. I have a USB mouse, I tried disconnecting it, still it resumed on its own after a few seconds. My keyboard is also USB but I haven't tried disconnecting that (yet) since I don't find it to be a likely culprit. Any ideas?