I can sleep “sleep”. All system components are still powered on at this stage, so it uses the most power. But at the same time it’s the quickest to get back into your system. All that’s really happening with sleep is that the screen turns off.
Then you have suspend. Laptops often first go to sleep but then suspend after a long period of inactivity to save battery.
Then you have hibernation. I don’t think this is used that often nowadays.