Fedora today:

dnf update
reboot
all is good
go get coffee
come back the screen is blank
does not wake up
the system is completely okay otherwise, but the screen is blank

This is basically a great incentive to NEVER UPDATE. Fedora tend to test their releases, but once the release is out of the door, updates drag in all sort of regressions. They have absolutely no checks from contaminating after a release.