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My new Charge 4 won’t show my sleep stages because it can’t get a “consistent” heart rate reading.

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My Charge 4 won’t show sleep stages because it says that it can’t  get a “consistent” heart rate reading, despite wearing it tightly, using the supplied wrist band, resetting the app (on an iPhone), and more. Suggestions, please. 

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To tight @Trevor_Jordan and the heart rate will not be accurate. Let's go to the help docs

What factors can affect my heart-rate reading on my Fitbit device?

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Thank you for the suggestion. I’ll try wearing the device more loosely, but
I have a big wrist and “looser” means on the last hole of the band. Can I
get a longer one?

Trevor Jordan
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