How fitness trackers track your sleep

Have you ever wondered how fitness trackers track your sleep? The best fitness trackers (opens in new tab) can already deliver a wealth of health data, monitoring everything from blood oxygen levels to atrial fibrillation – but how do they track your naps? And how accurate fitness trackers are (opens in new tab) when recording your dream?

We reviewed the latest data and spoke with Justin Roethlingshofer, the founder of OWN IT—a digital platform that helps coaches interpret fitness tracking data—to find out.

How does your fitness tracker track your sleep?

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