Phone screen turns off at night.

[Niriun]

I am having a problem with my galaxy s20 in which the phone display will go completely black at around 10pm.
I have verified that the phone is working, as it rings when called and I can answer the call by swiping in the correct position on the screen but the display remains off. 

I thought it may have been related to a sleep schedule setting however after disabling that the problem persists.

[Robin999]

Try wiping the cache partition first

https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/

Make sure you haven't got a battery saving mode/routine that kicks in at around that time. Also check you haven't set an auto restart of the phone. Look in Device Care>Auto optimisation>Auto restart.
Does your screen wake-up again at any ( or the same) time each day? Or do you have to restart the phone to fix it?

[Niriun]

I have wiped the cache partition, waiting to see if the error persists tonight.

I'm not sure what time exactly the display turns back on but I know that it definitely turns off at 10pm. It's such a weird issue as the touch screen and phone are otherwise functional, just no display.

I have checked for routines and all have been turned off. I thought the issue could have been with the eye comfort shield but that turned out not to be the issue either.

[Niriun · Accepted solution]

Wiping the cache partition seems to have remedied the issue. FYI the article you linked does not mention that you must have the phone physically connected to a computer in order to access the android recovery menu.