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how accurate is the fitbit?

I am concerned with my sleep efficiency. According to my fitbit one i average 40% efficiency. Can this be wrong?

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Hard to say if it is wrong or not, but the following help file gives some info on sleep tracking that may help:

https://help.fitbit.com/customer/portal/articles/1230068-about-sleep-tracking
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The fitbit only records movement (typically arm movement).  How that relates to sleep is based on the assumption you progress through 4 or 5 stages of sleep, and in deep sleep you don't move much.  

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