My RC build doesn't stay asleep. I can manually put it to sleep and it seems to wake up within an hour. If I just have the power management settings set to sleep after a while, it does go to sleep, but then it wakes up on its own. I did look through the Event Viewer and the best I can come up with is some Media Center thing.. I do/did try to use Media Center, but its pretty worthless for me now because the RC killed my TV audio.