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The Science of Sleep: What Your Smartwatch Data Is Actually Telling You

Every morning your COLMI smartwatch or smart ring gives you a sleep score. Maybe it's a 74, maybe it's an 88. Light sleep: 3 hours 12 minutes. Deep sleep: 1 hour 5 minutes. REM: 1 hour 40 minutes. ...

How Smartwatches Track Sleep: The Science Behind Sleep Scoring

Your smartwatch gives you a sleep score every morning, but do you know what it actually measures? Most people glance at the number — a 74 here, an 82 there — without understanding what's driving it...