Hmm - this Sleep function STILL isn't working as it did prior to Watch OS 8.0 and iOS 15......?
Before, if you had scheduled the 'Do Not Disturb' feature (I have this scheduled between 10pm and 7:00am) and you went to bed and turned on the 'Sleep' option (whereby the watch tracks your sleep), in the morning when you would wake up and turn off the 'Sleep' function (lets say at 6:30am), the scheduled 'Do Not Disturb' would remain ON and auto turn OFF at 7am.
On Watch OS 8.0 and iOS 15 and above, it no longer does this - when you wake in the morning (lets say you wake at 6:30am) and so you turn off 'Sleep', it now ALSO turns off the scheduled 'Do Not Disturb' (which should stay ON until 7am but it now turns OFF when turning OFF 'Sleep')...???