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Segmented sleep, sometimes referred to as bifurcated or divided sleep, is one of the original polyphasic sleep patterns. It is the basis of the [[Special:MyLanguage/Dual core|Dual core]] schedule line. In its non-reducing form, it is believed to have been practiced by some human societies since time immemorial until the advent of electric lighting . In short photoperiods (fewer daylight hours), it has been shown that human sleep is naturally segmented<ref>https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2869.1992.tb00019.x</ref>.  

Segmented sleep, sometimes referred to as bifurcated or divided sleep, is one of the original polyphasic sleep patterns. It is the basis of the [[Special:MyLanguage/Dual core|Dual core]] schedule line. In its non-reducing form, it is believed to have been practiced by some human societies since time immemorial until the advent of electric lighting . In short photoperiods (fewer daylight hours), it has been shown that human sleep is naturally segmented<ref name="wehr" />.

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<references />{{TNT|Polyphasic Sleep Schedules}}

<ref name="wehr">{{cite journal |vauthors=Wehr TA |date=1992 |title=In short photoperiods, human sleep is biphasic |journal=Journal of Sleep Research |volume=1 |issue=2 |pages=103-107 |doi=10.1111/j.1365-2869.1992.tb00019.x}}</ref>

{{TNT|Polyphasic Sleep Schedules}}

[[Category:Schedules]]

[[Category:Schedules]]

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