Yea, the Sleep Tracking on AW is ... lets be nice and say severly lacking. Having to put it in a sleep schedule/focus is just dumb. I'm sure Apple Executives and their little schedules can sleep and wake at the same time every day, but the rest of the world doesn't work that way.
I don't wear any device to sleep, and I don't need one to tell me if I slept well or not. If I cared about sleep tracking, I'd whip out my very old Fitbit from my junk drawer. Sleep Tracking is one area that they have always run circles around AW in.
I use it as often as I used the mute switch… pretty much NEVER.