I've got a Charge 3, the one with the oxygen sensor, and I've also seen it think I was asleep when I wasn't. On the other hand, it seems weirdly reliable at telling if I'm in REM sleep or not. Whenever I wake up directly from what it says was REM sleep I remember my dreams but not otherwise.

I just got the Charge 3 and I must toss and turn like crazy because it sometimes doesn't even register my sleep. I didn't expect it to be the most accurate sleep tracker, so I am not super upset. It still gives me some level of insight into my sleep, which is better than nothing.

>I didn't expect it to be the most accurate sleep tracker

I work for Fitbit. I don't speak for Fitbit, but in my opinion you should expect it to be the most accurate sleep tracker, and if it isn't you should contact customer service.

Maybe I will then. I just assume that the technology to accurately determine REM vs Deep or Light sleep is not really available, so I can't fault Fitbit or any manufacturer for not having perfect sleep trackers. But, the marketing material does claim it's very accurate, so I should probably get more out of it since that's what I was sold.

Thanks for the advice.

On the contrary, my Charge 2 is generally pretty accurate in terms of when I'm asleep vs awake.