I had this happen with a 11. Same exact issue. A factory reset fixed it.

It’s 1005 today. I know it’s not significant, but you should not have it. My honor fitness band that costs 1/10 th the price does much better sleep tracking without having to set up a sleep schedule.

Not only that, but if you turn off the single tap to wake (cos that triggers every damn time without it being need to), you can not turn off the alarm after the Lock Screen times out before the one minute mark. It’s one of my greatest miseries every damn morning. I press the lock button or the volume which only snoozes the alarm. I’ll have to turn on the screen then and then turn off the alarm. So mindlessly annoying. It works okay when you wear the Apple Watch to bed and can turn off the alarm. But the damn alarm vibrations count as steps that I have apparently taken.

I use an old iPhone SE just for alarms now.