First review of sleep score / recording and it’s not accurate. It recorded nearly a full night of 7.5 hours marked as Good, but I was awake for half of it. I think it makes a guess on what you have set as your desired sleep and whether you were relatively still.
Best AnswerWhen I have trouble sleeping, I shake my wrist or turn the watch on. If I am still and my HR is low, it may think I am asleep. This is just what every Fitbit of mine has been like.
ETA:
I am currently comparing the Sense to my Charge 4 and the Sense was much more accurate of my sleep last night. I will make a post either later today or tomorrow with a full comparison of the 2.