health
Key sleep metric linked to lower risk of 83 conditions across the body

Almost every tracker on the market, from rings to watches and even mattress pads, will estimate how much time you're spending in each phase of sleep.
Your Oura ring or Apple Watch may holds secrets about your health that you didn’t even realize.
There’s a lot wearables can tell us, from estimates of the calories we’ve burned to our heart rate variability to how much sleep we got last night.
But hi... [3236 chars]
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