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    Fitbit

    The Fitbit promises to not only track how many steps you take and how many calories you burn, but how long it takes you to fall asleep and how many times you wake up during the night.

    Sarah Morgan
    by Sarah Morgan

    Community Contributor

    Apparently your wrist "experiences tiny tremors" while you're slipping into REM sleep. So if you wake up feeling un-rested, you can check Fitbit's online database to find out exactly how long you were asleep, and thus justify your caffeine consumption with fancy statistics.

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