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In this March 1, 2017, file photo, women wear Fitbit's new Alta HR on their wrist while working out at a Swerve fitness center in New York. Fitbits already track how much people sleep and use sensors to measure periods of being awake or restless while in bed. Now, using a built-in heart-rate monitor, the devices will break sleep into clinically defined stages. (AP Photo/Mark Lennihan) ** FILE **

In this March 1, 2017, file photo, women wear Fitbit's new Alta HR on their wrist while working out at a Swerve fitness center in New York. Fitbits already track how much people sleep and use sensors to measure periods of being awake or restless while in bed. Now, using a built-in heart-rate monitor, the devices will break sleep into clinically defined stages. (AP Photo/Mark Lennihan) ** FILE **

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