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did you try switching to text mode tty console using Ctrl-Alt-F3 or -F4 or -F1 or so? if that works, maybe switching back helps. if switching back doesn't help, you can at least investigate the logs/journals with text mode.
Yeah, I'd certainly try to see if it's a graphical issue or actually locking up.
You can also try toggling num/caps/scroll lock to see if the keyboard LEDs respond. That's a core kernel function, so if even that isn't working, it's really locked up. (Or just really slow to respond.)
It didn't respond to that anymore after entering sleep mode
I see. You could try and enable Magic SysRq, but honestly I don't see how that would lead to a permanent fix.
Thanks for the suggestion, I hadn't heard of it yet and it seems very useful. However, I might as well just shut it down completely in this scenario if I have to reboot anyway.