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I think it depends on the duration. I've had it pick up a few naps that were in the 45min to 1 hour plus range, but miss some 'cat naps'. As far as regular sleep at night I find it to be pretty accurate.
Sorry, there was a problem. Please try again later.Great question, Garry. The Pixel Watch 4 determines sleep stages from movement and heart rate. After an hour of inactivity, it assumes you’re asleep. During sleep, it monitors heart rate variability through the light, deep, and REM stages, estimating cycles upon syncing. Check out this guide for more information: https://support.google.com/fitbit/answer/14236407
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