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How does fitbit know how much we sleep?

‎05-17-2015 04:29

‎05-17-2015 04:29

How does fitbit know how much we sleep?  Or when we are sleeping and when we are just laying still?  How accurate is it?

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‎05-17-2015 17:46

‎05-17-2015 17:46

I think it depends on if you have a HR Fitbit or not.  If you don't, it just measures if you're moving or not.  If you do have HR, it takes your heart rate into consideration as well (lower heartrate = sleeping).

I found the non-HRs to not be super accurate on sleep.

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‎05-19-2015 08:16

‎05-19-2015 08:16

I have wondered the same thing.  I have the Charge but not the HR.  I am not sure how it knows if I am sitting or "sleeping". 

It did however log sleep time while I was at the movies.  Funny, this was one movie that I didnt sleep through.

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