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Short sleep cycles do not produce data. Sometimes the way you sleep may cause the Fitbit to not make good contact. Hope this helps!
Sorry, there was a problem. Please try again later.I'm not qualified to answer this, I suggest calling Fitbit customer service
Sorry, there was a problem. Please try again later.When tracking sleep he may want to wear it a little tighter then he's used to. This may allow for more accurat reading.
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