If NoSleep is active, manually putting the computer to sleep using the Sleep button or clicking Apple > Sleep does not actually put the system to sleep. The screen turns off like it is, but it's still running full on. I confirmed it is in fact NoSleep doing this by disabling it via the ZZ icon and then putting the system to sleep. The system sleeps normally after doing this.
If NoSleep is active, manually putting the computer to sleep using the Sleep button or clicking Apple > Sleep does not actually put the system to sleep. The screen turns off like it is, but it's still running full on. I confirmed it is in fact NoSleep doing this by disabling it via the ZZ icon and then putting the system to sleep. The system sleeps normally after doing this.
This is essentially the same as this: https://code.google.com/archive/p/macosx-nosleep-extension/issues/133 However I could not add a comment to that bug to state that I was experiencing the same thing.