You're right. After reading your message I tried again with a "can't
hurt" attitude. Sleep sensing is now active *shrug*. I didn't even do
any restart. Just disabled it in the Home app and re-enabled it. Done.
I have exactly the same. When I first installed the hub, sleep sensing
was working. For unspecified reasons I removed every nest/google device
from the app. All my other issues are now fixed, but for the love of God
I can NOT get Sleep Sensing active...