How do activity trackers know when I’m asleep? How they deduce REM sleep, deep sleep etc?

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How do activity trackers know when I’m asleep? How they deduce REM sleep, deep sleep etc?

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They detect movement through either an accelerometer or by using a microphone to listen out for movements (as programmed by the software). Since each sleep cycle lasts roughly 30 mins, the tracker is really only guessing which stage of sleep you are in based on the time in bed and any movement detected throughout the night.