I built a system a year ago, & sleep has always worked fine until a few weeks ago when Windows 7 began to start waking instantly the moment I put it to sleep. Now I have to turn off the power management settings of the mouse & keyboard to stop it from waking. Sometimes it works in reverse too & won't wake with the mouse or keyboard ever when set to in the power management settings. I have checked to see what is waking it... & nothing is listed. I have tried 3 different brand keyboard & mouse (with nothing else plugged in), & I have reinstalled Windows 7... but now it always wakes instantly or not at all. I have also reset the BIOS default settings [ASUS P6T Deluxe V2] but the problem persists. This is totally boggling my mind, any ideas would be much appreciated.