Changes

<ref name="Ekirch">{{cite journal |vauthors=Ekirch AR |date=2016 |title=Segmented sleep in preindustrial societies |pages=715-716}}</ref>

<ref name="Ekirch">{{cite journal |vauthors=Ekirch AR |date=2016 |title=Segmented sleep in preindustrial societies |pages=715-716}}</ref>

<ref name="Samson">{{cite journal |vauthors=Samson DR |date=2017 |title=Segmented sleep in a nonelectric, small‐scale agricultural society in Madagascar |journal=American Journal of Human Biology |volume=29 |issue=4}}</ref>

<ref name="Samson">{{cite journal |vauthors=Samson DR |date=2017 |title=Segmented sleep in a nonelectric, small‐scale agricultural society in Madagascar |journal=American Journal of Human Biology |volume=29 |issue=4}}</ref>

<ref name="polynet">{{cite web |url=https://www.polyphasic.net/sleep-mechanics/polyphasic-sleep-adaptation/ |title=Polyphasic Sleep & Adaptation |website=polyphasic.net |access-date=2020-12-17}}</ref>

<ref name="polynet">{{cite web |url=https://web.archive.org/web/20201125214204/https://www.polyphasic.net/sleep-mechanics/polyphasic-sleep-adaptation/ |title=Polyphasic Sleep & Adaptation |website=polyphasic.net |access-date=2020-12-17}}</ref>

<ref name="polysurvey">{{cite web |url=https://youtu.be/BA24s8KwBi0 |title=Polyphasic Survey Results and Analysis |date=2018 |website=YouTube}}</ref>

<ref name="polysurvey">{{cite web |url=https://youtu.be/BA24s8KwBi0 |title=Polyphasic Survey Results and Analysis |date=2018 |website=YouTube}}</ref>

}}

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