My Computer Keeps Waking Up On Its Own

[flyoffacliff]

Every night between 4:45am and 5:55am, my computer wakes up on its own. I used to put it to sleep at night. But I recently changed it to hibernate instead, since I have a very fast computer. There is a BIOS option for "Set Wake Event By BIOS", or "Set Wake Event By Operating System". I left it set to BIOS (Default) and to not allow the mouse, keyboard, or any USB devices to wake the computer. I ran "powercfg /lastwake" in elevated CMD, which does not provide any useful information. The event viewer shows the wake entries, but they say "Wake Source: Unknown". Any ideas?

 

[tiny voices]

Make sure the computer isn't scheduled to check for new updates at that time.

 

[flyoffacliff]

Make sure the computer isn't scheduled to check for new updates at that time.

But it does it at a different time every night, and its not the time I have windows set to check. It could be another program, but how do I find out which?