It doesn't even have to be waking up from hibernate. Windows will decide it needs to reboot after installing updates even though BitLocker is configured to use

It doesn't even have to be waking up from hibernate. Windows will decide it needs to reboot after installing updates even though BitLocker is configured to use an extra PIN. On mine it wouldn't sit on the BitLocker screen forever. It would reboot after a little bit which would cause the fans to spin to max for a second. It's like having someone revving a car all night, but with the added anxiety of knowing it's wearing out your stuff. Microsoft owes me some sleep.