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Fitbit track sleep is not really accurate

I updated to flex 2 recently, but found my sleep pattern  changed to much less hour everyday.

I tested with both flex and flex 2, and both Fitbit are on my wrist, and result came out totally diff.

The flex 2 tells me 6h 50m, but flex tells me 8h 58m. So...which one is telling the truth ? I don't know if Fitbit is really a good device to track my sleep pattern now, I lost...

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