CNET News – How accurately do fitness trackers monitor sleep?

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As the “quantified self” craze continues, fitness trackers have us obsessing over not only how active we are but also how soundly we’re sleeping. How do the devices stack up against clinical sleep studies though? CNET’s Sumi Das visits the Stanford Sleep Center for an expert’s opinion.

 https://www.youtube.com/watch?v=yKacoMg4BcA
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