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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.
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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 ==
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[[File:Siesta default.png|thumb|A default Siesta variant]]
    
=== Siesta ===
 
=== Siesta ===
{{TNT|Siesta}}
   
[[Siesta]] sleep generally consists of a long core at night and a shorter core (siesta nap) midday. Siesta sleep tends to have around 6-8 hours of total sleep time.
 
[[Siesta]] sleep generally consists of a long core at night and a shorter core (siesta nap) midday. Siesta sleep tends to have around 6-8 hours of total sleep time.
    
This schedule also belongs to the [[dual core]] category by the amount of cores, albeit the mechanism is quite different from segmented/bifurcated sleep. By the mechanism this schedule is mostly similar to core-only schedules, such as [[Triphasic]] sleep or [[QC0]].
 
This schedule also belongs to the [[dual core]] category by the amount of cores, albeit the mechanism is quite different from segmented/bifurcated sleep. By the mechanism this schedule is mostly similar to core-only schedules, such as [[Triphasic]] sleep or [[QC0]].
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[[File:Segmented default.png|thumb|A default Segmented variant]]
    
=== Segmented ===
 
=== Segmented ===
{{TNT|Segmented}}
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[[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.
[[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.
      
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.
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[[File:E1.png|thumb|A default E1 variant]]
    
=== E1 ===
 
=== E1 ===
{{TNT|E1}}
   
[[E1]] or Everyman 1 consists of a long core at night and a nap midday. It tends to have around 6-7 hours of total sleep time as well. An extended version is possible for [[Age|underaged]] people as well as those with higher sleep requirements.
 
[[E1]] or Everyman 1 consists of a long core at night and a nap midday. It tends to have around 6-7 hours of total sleep time as well. An extended version is possible for [[Age|underaged]] people as well as those with higher sleep requirements.
    
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.
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=== BiphasicX ===
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[[File:BiphasicX.png|thumb|A possible BiphasicX variant]]
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[[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.
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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 />
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{{reflist|refs=
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<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>
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}}
 
{{TNT|Polyphasic Sleep Schedules}}
 
{{TNT|Polyphasic Sleep Schedules}}
 
[[Category:Schedules]]
 
[[Category:Schedules]]
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