Greetings. I've clean installed windows 8.1 pro vl x64 in my laptop (Windows Media Center is not installed of course). and activated successfully with KMSmicro 5.0.1. Windows is fully updated. I have this problem: it wakes unexpectedly from sleep at either 04:00 or 05:00 at night. I check in the Event Viewer and the first entries after the wake are always, eg.: Code: Event: Kernel-General Description: The system time has changed to 2013-11-24T03:19:07.500000000Z from 2013-11-24T00:19:12.031510800Z. Change Reason: System time synchronized with the hardware clock. Code: Event: BTHUSB Description: Windows cannot store Bluetooth authentication codes (link keys) on the local adapter. Bluetooth keyboards might not work in the system BIOS during startup. and Code: Event: Power-Troubleshooter The system has returned from a low power state. Sleep Time: 2013-11-24T00:19:02.334201600Z Wake Time: 2013-11-24T03:19:09.179443500Z Wake Source: Unknown The following is what I've tried so far based on these two links: Spoiler superuser.com/questions/494235/how-can-i-prevent-my-computer-from-waking-up-accidentally support.microsoft.com/kb/2799178 1a. Go to Device Manager Select each keyboard and mouse device and right-click Properties Go to the Power Management tab and untick "Allow this device to wake the computer". 1b. Doublechecked the above for my onboard ethernet network card 2. Checked in Task Scheduler and no active task is set to allow to "wake the computer to run this task" having such launch time. 3. Checked in Automatic Maintanance and "Allow scheduled maintenance to wake up my computer at the scheduled time" is disabled. 4. Ran cmd as admin, and: Code: C:\Windows\system32>powercfg /lastwake Wake History Count - 1 Wake History  Wake Source Count - 0 C:\Windows\system32>powercfg /waketimers There are no active wake timers in the system. C:\Windows\system32>powercfg /devicequery wake_armed NONE C:\Windows\system32>powercfg /waketimers There are no active wake timers in the system. NONE 5. checked in Power Options>change plan settings>change advanced power settings and the "Allow wake timers" is disabled for both On Battery and Plugged in. 6. There's no relevant setting in the BIOS. Can't think of anything else to check. Please help.