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How accurate is FitBit in measuring sleep patterns?

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I ask because I am showing lots of activity for REM and light sleep but little or none in deep sleep, which is hard to imagine or I'd be a walking zombie.

 

Unless, I actually an a zombie -- in which case I would think FitBit would not show a pulse either, but...

 

 

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@SkipII A warm welcome to our Community! Thank you for your inquiry. I can comment on my personal experience and while I am no doctor the Charge 2 has been pretty good detecting my sleep pattern including being quite accurate on the start and end time of my sleep (which I found great). Still you can read more about sleep stages and how they are calculated here.

 

Let me know how it goes!

Alvaro | Community Moderator

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