After a recent update, the wakeup after sleep functionality is broken. The system itself wakes up (fans spin up), but the displays do not receive a signal.
Power management is fragile as the kernel needs to work with vendor firmware. With Nvidia there is system firmware and also Nvidia proprietary firmware. In the past, I have had Nvidia issues due to kernel changes that Nvidia’s drivers mishandle. Linux customers can only wait for Nvidia to fix their code. You need to provide enough detail to allow others with similar hardware to reproduce the issue (as text, so it will be found by web searches).
provide the output from running inxi -Fzxx in a terminal (as pre-formatted text using the </> button from the top line of the text entry panel).
use journalctl --no-hostname -b and scan for the section where the system sleeps, then look for errors when the system resumes, then post a short excerpt (as pre-formatted text).
If you can find relevant error messages you can search for reports of the same issue in Nvidia forums. I usually find that someone has already reported issues by the time I have gathered the details.
I downgraded the kernel sudo dnf downgrade kernel and then afterwards hopped back into the newer kernel via grub boot screen and everything worked again.
I am not sure if that was the thing that solved it or if I made updates in the meantime.