I have observed that my system actually wakes up after putting it to sleep. I have tried different power configuration options including hybrid sleep but in vain. And I'm sure that all wakeups are disabled when the device is on battery. All the drivers / BIOS are up to date. Today, I put my machine to hibernate and when I was about to turn on, fans were already spinning at high speed, no need to say, the machine's temperature was *** high. I suspect that this is because of some sleep bug - I observe many Kernel-Power 107 and Power-Troubleshooter 1 events in the system event log during sleep time. Any one have any clues regarding this? Any help is greatly appreciated.