Have you already tried this? Hibernation and Sleep options not working, "Login Screen" shows instead - #2 by Dinomonster
Again, a search for “sleep” would be a good idea. “Hibernate” and “hibernation” too.
Sleep: https://forum.endeavouros.com/search?q=sleep%20order%3Alatest
Hibernate: https://forum.endeavouros.com/search?q=hibernate%20order%3Alatest
Hibernation: https://forum.endeavouros.com/search?q=hibernation%20order%3Alatest