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Why We Nap: Evolution, Chronobiology, and Functions of Polyphasic and Ultrashort Sleep

Abstract Polyphasic sleep describes the ubiquitous rest—activity pattern observed in nature, in which animals show bouts of activity and rest alternating several times per day. Related Information.


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Sleep: Polyphasic - Stampi - - Major Reference Works - Wiley Online Library

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Evolution, Chronobiology, and Functions of Polyphasic and Ultrashort Sleep

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It's time to take chronobiology seriously - Thomas Kantermann - TEDxGroningen

Request Username Can't sign in? According to Stampi, the improvement is due to an extraordinary evolutionary predisposition to adopt such a sleep schedule; he hypothesizes this is possibly because polyphasic sleep was the preferred schedule of ancestors of the human race for thousands of years prior to the adoption of the monophasic schedule.


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According to EEG measurements collected by Dr. Stampi during a day trial of polyphasic ultrashort sleep with a test subject [1] and published in his book Why We Nap , the proportion of sleep stages remains roughly the same during both polyphasic and monophasic sleep schedules. The major differences are that the ratio of lighter sleep stages to deeper sleep stages is slightly reduced and that sleep stages are often taken out of order or not at all, that is, some naps may be composed primarily of slow wave sleep while rapid eye movement sleep dominates other naps.


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From Wikipedia, the free encyclopedia. Not to be confused with Why We Sleep. However, in this volume the term nap is not used in the narrower sense of an afternoon siesta; instead, emphasis is placed on the recurrent alternation between states of alertness and drowsiness, i.

Why We Nap

In view of this focus, two authors Stampi, in Chapter I, and Ball, in Chapter 3 rightly refer to the psychologist Szymanski who was among the first to describe "polyphasic" activity patterns. Hence, I consider it appropriate to open this foreword with a few historical remarks.

Although the botanists quite some time ago had demonstrated the endogenous nature of the "monophasic" sleep movements in plants, the hypothesis of an still unknown external driving force was favored by those who studied rhythms in animals and humans Aschoff, Convert currency.

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