Killing all of the wake timers and editing specific keys in the registry will usually fix this, but it's messy and not something typical users are comfortable doing.
This PC was kept reasonably up to date, too (usually installed whatever update at the most a day or two after they came out, complete with the reboot), so not sure what it was hoping to do, exactly.
I'm sure you mistakenly used sleep instead of hibernate without knowing or remembering, to have that issue, or you had the issue where hibernate didn't work and reverted to sleep instead.
I also had that issue and discovered that the Linux dual-boot installation with Grub's changes to the MBR broke Window's capability to hibernate, so me hitting hibernate was actually triggering sleep instead.
Hibernate does not randomly wake up.
https://learn.microsoft.com/en-us/windows-hardware/drivers/k...
Here’s an example of a Windows machine waking from hibernate and how it was fixed:
https://www.bleepingcomputer.com/forums/t/707115/windows-10-...
These kinds of problems are not uncommon and are not always due to users confusing the different sleep states.
The USB bus and sound system is still the weak spot on a windows computer in my experience, this website, reddit, youtube, or dailymail generally takes them out.
Surprised that people used sleep and hibernate, considering TSR's were invented in the dos days and the browser can do lots of fancy stuff.
Theres even a reg setting to clear the page file on shutdown.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\ ClearPageFileAtShutdown Dword32 1
You're confusing that with sleep. Windows can't wake itself from hibernate as the machine is fully powered off, not in some sleep state.
The difficulty of disabling wake timers has been exaggerated, though. It's in the advanced power settings, there's no need for the big scary registry.
https://www.tenforums.com/tutorials/63070-enable-disable-wak...
Yes, it can se timer to wake automatically from hibernate, but that doesn't mean it does that automatically withotu you setting those timers. I can understand there have been some bugs in the past but that's anon-issue today.
The issue isn't that it doesn't go to sleep. It's that it doesn't stay asleep.
