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===Original variants===
 
===Original variants===
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[[File:DC1 original.png|thumb|Original DC1 variants]]
File:DC1 Polysoc 1.png
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These are the versions originally proposed by Polyphasic Society. Both of these give a total of 5h in core sleep.  
File:DC1 Polysoc 2.png
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These are the schedule variants originally proposed by Polyphasic Society. Both of these give a total of 5h in core sleep. The first variant has the same core 1 as Segmented, and may allow for a smoother transition from it. It closely resembles the current default version, and most of what is said about the standard one also applies to it.
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The second one is more balanced in terms SWS and REM peak, and may allow for a more complete repartitioning. However, 2.5-hour cores increase the likelihood for SWS wakes. This increases the chance for oversleeping, especially in the first core. For some, waking up from SWS and/or REM is extremely challenging and best avoided. This variant may be better for those needing more REM than SWS.
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The first (outer) variant has the same first core as Segmented, and may allow for a smoother transition from it. It closely resembles the current default version, and most of what is said about the standard one also applies to it.
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Adapting to this variant may eventually result in 4 sleep cycles of ~75 minutes. However, this is mostly hypothetical and requires more data to confirm.  
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The second (inner) one is more balanced in terms SWS and REM potential, and may allow for a more complete repartitioning. However, 2.5-hour cores increase the likelihood for SWS wakes, which can increases the chance for oversleeping, especially in the first core. For some, waking up from SWS and/or REM is extremely challenging and best avoided. This variant may be better for those needing more REM than SWS. Adapting to this variant may eventually result in 4 sleep cycles of ~75 minutes. However, this is mostly hypothetical and requires more data to confirm.
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===Slightly modified core durations ===
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===Slightly modified core duration ===
[[File:DC1-mod.png|thumb|Slightly extended cores]]
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[[File:DC1-mod.png|thumb|Slightly shortened/extended cores]]
This variant relies on a slightly longer second core to account for a higher REM need. The higher total sleep also increases the chance for flexing either cores to greater effects. However, the 2.5-hour core may result in unpleasant wakes during adaptation. This  
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A slightly longer second core can account for a higher REM need. The higher total sleep also increases the chance for flexing either cores to greater effects. However, the 2.5-hour core may result in unpleasant wakes during adaptation. This  
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[[File:DC1 Slightly Shortened.png|thumb|Slightly shortened cores]]
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Using slightly shortened cores would be more difficult, as it has less total sleep time. Repartitioning of sleep stages will need to be more intense than on the standard version. This may be suitable for those with slightly lower monophasic needs (~7h). It is unknown how flexible the variant would be after adapting, since there are no records of its flexibility, and the successful adaptees did not maintain the schedule long enough.  
This one is more difficult than the standard one, as it has less total sleep time. Repartitioning of sleep stages will need to be more intense than on the standard version. This may be suitable for those with slightly lower monophasic needs (~7h). It is unknown how flexible the variant would be after adapting, since there are no records of its flexibility, and the successful cases did not continue to maintain the schedule or attempt to make it flexible after a couple months on it.  
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===30m nap===
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===Shortened cores and 30-minute naps===
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[[File:DC1-30m.png|thumb|30min naps and shortened cores]]
File:DC1 30m nap.png|Version 1
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These variants are derived from [[Triphasic]], and have significantly less total sleep than standard DC1. They extend the night and morning cores, while shortening the daytime core of Triphasic to a 30m nap for ease of scheduling. Because there are 2 cores and 1 nap. Both attempts and adaptations have been rare, possibly because of the uncommon core lengths leading to difficult wakes.  
File:DC1 30m nap 2.png|Version 2
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</gallery>These variants are derived from [[Triphasic]], and has significantly less total sleep than standard DC1. They extend the night and morning cores, while shortening the daytime core of Triphasic to a 30m nap for ease of scheduling. Because there are 2 cores and 1 nap. Both attempts and adaptations have been rare, possibly because of the uncommon core lengths leading to difficult wakes. These two variants are likely to be much more difficult than standard DC1, perhaps similar to Triphasic in difficulty.
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===Long morning wake gap===
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Note that these two variants are likely to be much more difficult than standard DC1 ("Hard" or "Very Hard" category), perhaps similar to Triphasic.
[[File:DC1 Long Morning Gap.png|thumb|A DC1 variant with 8h morning wake gap|alt=]]
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The idea was originally posited by Polyphasic Society, where the heavy concentration of both cores at night resembles E1 or some sort of Biphasic schedule. The wake gap between 2 cores decreases to 4h, while there is an 8h wake gap between the second core and the nap. The promised utility from this setup is that it has a better chance to work from morning to afternoon hours without the possibility to have a nap around noon or during work. However, this has been very difficult, and has essentially zero successful adaptation because of the long morning gap. Individuals with lower sleep requirement can take advantage of this variant, because they usually can '''stay awake longer''' with a more distant sleep distribution, than an average person would.
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===Extended===
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[[File:DC1-ext.png|thumb|Two possible ways to extend DC1]]
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Both of these variants over the years have reported a lot of success. They are more beginner-friendly, but offers less sleep reduction. Those with a higher monophasic baseline (~9h) are also recommended to attempt these variants.
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The choice between the two depends on the balance of SWS and REM requirements. The 3-3 variant would favour more balanced or higher REM needs, whereas the 4.5-1.5 favours higher SWS needs, such as with those who regularly perform intense exercise. Both variants allow a somewhat later first core (up to ~23) compared to the default variant.  
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This is a common ground in scheduling with E2 as well, with the morning gap between both naps usually '''no longer than ~6h''' to ensure no excessive tiredness during the whole wake gap to be adaptable. The afternoon wake gap on DC1 and E2 (from the last nap of the day to the core) is usually tolerable even if they appear to be longer than the recommended length. Since it is deemed easier to stay awake during the day, up to '''9h wake''' is viable for the afternoon gap (for average individuals).  
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These variants also allow a long morning wake gap, up to ~8-9 hours. As it has a higher total sleep time, maintaining alertness is much easier than on regular DC1. This may allow one to stay awake through the workday, and then have a nap after work (at ~16-17). These are also known to be much more flexible, both in the cores and in the nap. After adapting, one can also proceed to [[DC2]] to as a route to adapt to [[DUCAMAYL]].  
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=== Siesta-alike===
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===Longer post-core gap===
[[File:Siesta-alike.png|thumb|A DC1 variant with a core-nap flip|alt=]]
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[[File:DC1 Long Morning Gap.png|thumb|A DC1 variant with 8h morning wake gap|alt=]]
It is uncertain what the advantages of this scheduling would be compared to the traditional setup, where the second core is placed at hours that are virtually safe from any real life interruptions. However, some individuals do claim that a short nap around sunrise hours would give more chance for vivid dream recall than a core sleep, probably because of a higher percentage of REM sleep in a nap than in a core, and the period of REM that ends before awakening is likely shorter on a nap than on a core. '''Only one person has reportedly succeeded''' at adapting to this variant. The daytime core looks like that on Siesta, but it is questionable how it can be managed long-term, while a daytime nap is a lot more convenient to schedule.  
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On this variant, the core gap is shortened and the core-nap gap is lengthened. This may be easier to schedule for some. However, this has been very difficult, and has essentially few successful adaptations. Individuals with slightly lower sleep may be more able to do this, as they can stay awake longer at a given total sleep time.
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===Extended Variants===
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Similar to E2, the morning gap is suggested to be no more than 7-8 hours. The evening gap can be up to about 9 hours, because sleep pressure is lower then.
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File:DC1-extended.png|DC1-extended (Version 1)
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File:DC1-extended 2.png|DC1-extended (Version 2)
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</gallery>Both of these variants over the years have reported a lot of success (although more for the 4.5-1.5 core distribution). They are very '''beginner-friendly''' and offer a reasonable amount of sleep reduction (~90m of sleep cut from an 8h monophasic baseline). Those with a higher monophasic baseline (~9h) are also recommended to pick either variant. The choice between either variants comes down to REM and SWS requirements. A higher REM requirement would favor the 3-3 core combination, while a person with high SWS needs or exercise a lot for muscle growth can pick the 4.5-1.5 variant. Both variants also have an advantage that the regular version oftentimes does not, is the ability to have a somewhat later first core sleep, to '''start around ~11 PM''' rather than 9 or 10 PM on the default version.  
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Another benefit that either variant can afford is the ability to have a long morning wake gap, up to '''~8h before the nap''' is taken because of a higher total sleep. Wakefulness sustaining is expected to be a lot easier than on a regular DC1 variant. This could allow one to stay awake through work, and then have a nap after work (~4-5 PM). There are also a lot of flexibility potential after the adaptation to this variant. One can choose to proceed to '''DC2''', or simply learn to make the extended version flexible to adapt to '''DUCAMAYL'''.  
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=== Core-nap flip===
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[[File:Siesta-alike.png|thumb|A DC1 (extended) variant with a core-nap flip|alt=]]
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Some individuals find that a nap around REM peak results in more vivid dream recall compared to a core. This variant makes use of a dawn nap, moving the second core to a position similar to [[Siesta]]. Attempts are very rare, and only one person is known to have successfully adapted to it. This variant is not recommended.
    
==References==
 
==References==
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