A validation study of Fitbit Charge 2™ compared with polysomnography in adults: Chronobiology International: Vol 35, No 4
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I was happy because when I woke up I assumed I had 7 hours of sleep. Turns out I was awake for an hour last night. How?! Fitbit Charge 2, is this
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How Much Sleep Do Fitbit Users Really Get? A New Study Finds Out
