Mac won't go to sleep - sleep greyed out in Apple menu.

RichardFJames wrote:

I cannot put my MacBook Pro 2022 to sleep. The sleep menu under Apple Menu is grey. I can't find anyway to bring it back to black. Closing the lid doesn't put it to sleep. I have restarted, started in safe mode. etc. I am stumped - why is 'sleep' greyed out in the Apple Menu?

on an M-series Mac a SafeBoot Use safe mode on your Mac - Apple Support will sort many anomalies

Does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled temporarily.

Login and test. Reboot as normal and test. Caches get rebuilt automatically.

out of curiosity you can see your power management settings from the Terminal.app copy and paste:

  pmset -g assertions

if no insight you can try resetting to defaults copy and paste:

sudo pmset restoredefaults

(note: your psswd will not echo on screen type it in any way, use the enter\return key to proceed.)

reboot and compare your results.