I can't sleep! Not me, my Mac Pro
Sadly, Apple removed the sleep indicator from the newer Mac computers. In the past, the power indicator would have a "pulse". This was very useful to know if your Mac was really sleeping. With newer Macs, there's no easy way to tell this, but there is a way. My 2020 Mac Pro will only go to sleep if done so manually.
I have a Cyberpower UPS for my 2020 Mac Pro. It displays the wattage being consumed. When I set my Mac Pro go to sleep after 10 minutes, I can see the power go down when the display goes dark. But I can tell by the wattage used that the computer itself is still running. If I put the computer to sleep manually the total wattage connected goes way down to about 10 watts, if I let my Mac go to sleep with the automatic settings, the wattage never goes below about 150 watts telling me the computer is still running.
My settings are to sleep after 10 minutes. The ONLY box checked is "Put hard disks to sleep when possible". The box that reads "Prevent your Mac from automatically sleeping when the display is off" is unchecked.