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Calculate the number and amplitude of movements of a sleeping person per unit of time. Based on this, they try to separate the phases of wakefulness, light sleep, HDD and deep sleep.
It is believed that waking up in light sleep mode is most easy. Therefore, if the tracker is combined with an alarm clock (most trackers are designed for this purpose), then when the wake-up window is reached, the tracker waits for the first movement, and then turns on the wake-up call.
Android uses a built-in orientation sensor to detect concussions. Recently, many applications have appeared that use this sensor in an unconventional way. Noom Pedometer and Google Fit, for example, use this sensor to count the number of steps taken.
For a more accurate determination of the sleep phase, more expensive and more advanced trackers with a put-on headband-an encephalograph-are used. However, trackers with a motion detection detector, when placed under the pillow, also give a completely plausible picture of sleep at the output.
Personally, I use the sleep tracker “Sleep as Android”, but I can not consider myself an expert in this matter and declare this application the best: I probably did not try all the trackers, and during the year while I use this application, something new may well have appeared on the market.
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