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Why don't more smartwatches use this smart ring's seemingly obvious trick?
The Ultrahuman Ring Air is adding a new "Smart alarm" feature based on your sleep zones, and every smartwatch or ring should offer it.
Even though I hate wearing watches to bed, I tried it during my Charge 6 review and found it worked as intended, avoiding any sudden jolts awake. So I'd imagine some simple if/then conditionals would make this feature possible: If the time is during the requested wake-up window, check the current sleep stage; if deep or REM, wait 1 minute, then check again; if light, trigger the alarm; and if users hit the end of the wake-up window while still in REM, trigger alarm anyways so they don't oversleep. I know some smart alarm clocks detect your stage by picking up movement, but those don't work as well for couples since either person could trigger the not-dreaming state.
Or read this on Android Central
