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== Mechanism ==
== Mechanism ==
Biphasic schedules have been naturally used by humanity over the centuries<ref>Ekirch AR. [https://academic.oup.com/sleep/article/39/3/715/2454050 Segmented Sleep in Preindustrial Societies]. ''Sleep''. 2016;39(3):715-716. doi:[https://doi.org/10.5665/sleep.5558 10.5665/sleep.5558]</ref>. Their mechanism is mostly not the same, and only high total sleep time is a similar feature. Less reduction is possible because of the [[wake time reduction]] mechanism, as biphasic schedules have only two blocks of sleep, which is not enough to sleep much less than on [[monophasic]] sleep. The maximum possible reduction is usually around 1-3 hours. All the biphasic schedules also belong other polyphasic schedules categories.
Biphasic schedules have been naturally used by humanity over the centuries<ref name="Ekirch2016" />. Their mechanism is mostly not the same, and only high total sleep time is a similar feature. Less reduction is possible because of the [[wake time reduction]] mechanism, as biphasic schedules have only two blocks of sleep, which is not enough to sleep much less than on [[monophasic]] sleep. The maximum possible reduction is usually around 1-3 hours. All the biphasic schedules also belong other polyphasic schedules categories.
== Biphasic schedules ==
== Biphasic schedules ==
=== Segmented ===
=== Segmented ===
[[Segmented]] sleep, sometimes denoted DC0 (dual core with zero naps), has one core sleep generally around dusk and one core sleep generally around dawn a few hours after the end of the dusk core. Segmented sleep tends to have around 6-8 hours of total sleep time.
[[Segmented]] sleep, sometimes denoted as DC0 (dual core with zero naps), has one core sleep generally around dusk and one core sleep generally around dawn a few hours after the end of the dusk core. Segmented sleep tends to have around 6-8 hours of total sleep time.
This schedule belongs to the [[dual core]] category both by the amount of cores and by the mechanism of segmentation and is a nice starting point for the gradual adaptation to DC schedules.
This schedule belongs to the [[dual core]] category both by the amount of cores and by the mechanism of segmentation and is a nice starting point for the gradual adaptation to DC schedules.
This schedule also belongs to the [[everyman]] category both by the amount of cores and by the mechanism of replacing one sleep cycle with one nap, and is a nice starting point for the gradual adaptation to Everyman schedules.
This schedule also belongs to the [[everyman]] category both by the amount of cores and by the mechanism of replacing one sleep cycle with one nap, and is a nice starting point for the gradual adaptation to Everyman schedules.
=== BiphasicX ===
[[File:BiphasicX.png|thumb|A possible BiphasicX variant]]
[[BiphasicX]] is a flexible [[non-reducing]] biphasic sleep schedule, which consists of two blocks of sleep of any length. This schedule can combine all the other biphasic schedules. Usually it takes form of a non-reducing E1 / Siesta, having a long core at night and a short nap / core midday. However, a Segmented-oriented variant is also possible.
This schedule has a potential for those, who needs a great sleep flexibility since the very beginning, as the adaptation is usually very mild and the absence of sleep reduction makes it possible to have a wider flex range.
== References ==
== References ==
<references />
{{reflist|refs=
<ref name="Ekirch2016">{{cite journal |last=Ekirch |first=AR. |date=2016 |title=Segmented Sleep in Preindustrial Societies |url=https://academic.oup.com/sleep/article/39/3/715/2454050 |journal=Sleep |volume=39 |issue=3 |pages=715-716| doi=10.5665/sleep.5558}}</ref>
}}
{{TNT|Polyphasic Sleep Schedules}}
{{TNT|Polyphasic Sleep Schedules}}
[[Category:Schedules]]
[[Category:Schedules]]
