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Looks like you’ve had your Fitbit for a couple of years. The sleep score feature was introduced last summer. Has it been working OK for you ever since? In other words, was last time the first time Fitbit failed to detect your sleep (and therefore calculate a score for it)? Was there anything special about last night? See what happens tonight, maybe last night was just an outlier. I’m not aware of any way to "fix" sleep after the fact.
Dominique | Finland
Ionic, Aria, Flyer, TrendWeight | Windows 7, OS X 10.13.5 | Motorola Moto G6 (Android 9), iPad Air (iOS 12.4.4)
Take a look at the Fitbit help site for further assistance and information.
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