Sleep tracking doesn't work after WatchOS 10.3 update

FWIW, tried a number of troubleshooting steps, including

1. Telling Apple Watch not to be a source of sleep data, and then back on again
2. Hard-restart of Apple Watch (holding crown button + side button for 10 seconds)

and, at least last night, it tracks again.

Same. SE (version 2)

Same for me. I have Apple Watch SE 2nd gen, no longer sleep tracking after updating to 10.3