Most of us know about circadian rhythms and the sleep cycle. We have a basic idea of REM. We know it’s best not to wake up during a deep sleep. But all of this used to be academic. It wasn’t like you could watch yourself sleep. Alarm clocks were set for a certain time, and that time had nothing to do with how deeply you were snoozing.
The original article can be found here: http://www.foxnews.com/tech/2017/09/23/using-tech-to-get-good-nights-rest.html
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