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Lately I've been using an alarm clock that determines what phase of sleep you are in (light or deep) so that it waits until you are at a lighter sleep phase before waking you up.

It does this by using the microphone and motion sensors to determine if you are moving around or not.

I was wondering if there were a more accurate method of determining this and I was thinking that maybe the person's heart rate would have a noticeable difference between the different sleep phases, is this correct?

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To have a really precise way to determine the sleep phase you must be under EEG beacuse HR is much more influenced by circadian rhythms as you can read here.

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