There are many reasons for picking up one of the best Fitbits, and for a lot of people those reasons include being able to track their sleep. Strap a Fitbit smartwatch or tracker to your wrist and ...

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Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. The Apple Watch has a ...