It's probably your Do Not Disturb feature. Go to Settings>Notifications>Do Not Disturb and turn off the Sleeping toggle (or edit the times there).
Show us a screenshot of your Do Not Disturb menu. I'm looking at the one in my A32 5G.
Is there anything under "Schedule"?
No, that screenshot you shared is specifically for the Schedule part of Do Not Disturb. Tap that left-facing arrowhead at the upper left to get to the main Do Not Disturb menu.
Ok, that looks like it's not on. Samsung just recently added Bedtime Mode, so see if that's on: www.samsung.com/au/support/mobile-devices/setup-bedtime-mode/
Check Bixby routines anything scheduled?
If you go to settings >sounds >is temporary mute on or custom schedule?no it wasn't that, either.
Thanks