Most people go to sleep in a monophasic sleep cycle for 6-8 hours each night. Polyphasic sleep cycles consist of sleeping several times in a 24 hour period that total between 2-4 hours. You may find that you can operate on less sleep using these methods, but some people can experience negative side effects.
Brain hack weblog High Existence reports that the shorter more frequent periods of sleep experienced with polyphasic cycles trick the body into entering Stage 5 REM sleep immediately instead of the 45-75 minutes it normally takes. This is why, according to High Existence, you can sleep less overall and function without problem.
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