Mac OS update cause sleep/wake issues

Why does every new Mac OS update cause sleep/wake issues, where the machine sleeps for a few minutes, then wake and again the same loop? Is this only with me or is this a normal procedure? It does not happen on Catalina though (at least not all the time…)!

Hey there!
Is normal, the mac need to take some time to reboot and then start
Check the information in this link
Hope it helps