Apple Watch says I'm asleep long after I get out of bed

Once every week or two, my watch says I was asleep for several hours after I actually got out of bed, e.g. when I was in the kitchen having breakfast and reading the news. My wife is having the exact same problem. Mine is an iWatch 9, brand new. Yes, I read all the other advice in these forums, and everything is configured correctly

[Edited by Moderator]