No stress measured, no sleep recorded on watch since yesterday

This is probably not related to your problem, but just something to check if you ever face this again:

I once wondered why I didn't see any sleep data recorded in the morning. It was because I had forgotten to save the previous night's activity. My activity was paused instead of saved, and hence, watch didn't obviously record sleep.

I had no issue with paused activity. But had issue with watch rebooting after I stopped activity. And actuallly after that stress was off, and no sleep data that night.

After that I had one activity on Sunday, after which stress got back :D,  interesting

I didn't notice the pattern