Yeah. I have noticed that the relative changes in numbers seem to be very correct. I can’t validate the absolute numbers, so I don’t really look at those so muc

Yeah. I have noticed that the relative changes in numbers seem to be very correct. I can’t validate the absolute numbers, so I don’t really look at those so much. For the Apple Watch, I’ve noticed that the sleep tracker is quite accurate too, in absolute terms. That is, when I remember having long, wild dreams, I have a substantial amount of REM time. When I don’t remember my partner doing whatever at some hour, I was in deep sleep. If I toss and turn a lot, I see a lot of awake segments. So that part seems pretty accurate.