[gibba999]

I've had hibernated laptops wake up for whatever reasons in bags before. They get super-hot and shut down.

Come to think of it, they were Dells. Perhaps some switch is not properly debounced or something.

[_Microft]

I once investigated why a PC occasionally turned on all by itself and at first suspected that something on the network might be sending wake on LAN packets. It turned out that the PC was only in sleep mode and not hibernating and that Windows can wake it up from there, e.g. because of scheduled maintenance. What was even more surprising, it will go back to sleep once it is done.

You might want to check the event viewer in cases like that.

[gibba999]

I don't run Windows. I believe I was running Ubuntu at the time this was a problem, possibly Debian. This was a few years back.

[tomjen3]

This explains why my old windows laptop is constantly out of juice whenever I need to do something with Windows, even though I was sure I set it to hibernate.

The last time I turned it of, I removed the battery. It is pretty silly that my laptop in 2021 can't do what my first laptop could do in 2003. Even worse, it is a Thinkpad. I expect better from those.

[curt15]

The Surface Pro 4 had that problem for months after its release. https://www.reddit.com/r/Surface/comments/4hnhuz/just_took_m...

[RGamma]

Had similar issues. Has something to do with wake timers (see powercfg /waketimers)

Sometimes caused by drivers or periphery. Good luck disabling them all.

No idea how modern sleep plays into this. The Linux hibernate turns the system off for real (battery can be removed).