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Dual Core 1, or DC1, is the first [[Special:MyLanguage/Dual core|Dual Core]] schedule, which is the result of cutting some sleep from the second core of Segmented and the addition of one daytime nap to compensate.<ref name="polysoc" /> DC1 is also considered a relatively easy schedule, and is often recommended to beginners.
Dual Core 1, or DC1, is the first [[Special:MyLanguage/Dual core|Dual Core]] schedule, which is the result of cutting some sleep from the second core of Segmented and the addition of one daytime nap to compensate.<ref name="polysoc" /> DC1 is also considered a relatively easy schedule, and is often recommended to beginners.
==Origin== <!--T:18-->
==Origin== <!--T:18-->
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DC1 was originally proposed by [[Special:MyLanguage/Polyphasic Society|Polyphasic Society]]. Two variants are proposed, which are detailed in the [[Special:MyLanguage/#original-variants|Original variants]] section. The [[Special:MyLanguage/Polyphasic Sleep Discord|Discord]] community later slightly modified the schedule, to its current default form.
DC1 was originally proposed by [[Special:MyLanguage/Polyphasic Society|Polyphasic Society]]. Two variants are proposed, which are detailed in the [[Special:MyLanguage/#original-variants|Original variants]] section. The [[Special:MyLanguage/Polyphasic Sleep Discord|Discord]] community later slightly modified the schedule, to its current default form.
==Mechanism== <!--T:20-->
==Mechanism== <!--T:20-->
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DC1 is often compared to [[Special:MyLanguage/E2|E2]], as both schedules have sleeps placed at similar times of day. They have a similar amount of total sleep and the same number of sleep blocks (3) per day, with the main difference being E2 having a dawn nap rather than a dawn core on DC1.
DC1 is often compared to [[Special:MyLanguage/E2|E2]], as both schedules have sleeps placed at similar times of day. They have a similar amount of total sleep and the same number of sleep blocks (3) per day, with the main difference being E2 having a dawn nap rather than a dawn core on DC1.
==Adaptation== <!--T:25-->
==Adaptation== <!--T:25-->
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Adaptation to DC1 is usually done [[Special:MyLanguage/cold turkey|cold turkey]]. Alternatively, it is also possible to adapt to this schedule [[Special:MyLanguage/gradual adaptation|gradually]] by first adapting to Segmented sleep.
Adaptation to DC1 is usually done [[Special:MyLanguage/cold turkey|cold turkey]]. Alternatively, it is also possible to adapt to this schedule [[Special:MyLanguage/gradual adaptation|gradually]] by first adapting to Segmented sleep.
=== Cold turkey=== <!--T:27-->
=== Cold turkey=== <!--T:27-->
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However, for sleepers who have been adapted to Segmented and remain on it for a long time, the transition to DC1 at this point puts them on equal grounds with natural Segmented sleepers who are about to start a DC1 adaptation.
However, for sleepers who have been adapted to Segmented and remain on it for a long time, the transition to DC1 at this point puts them on equal grounds with natural Segmented sleepers who are about to start a DC1 adaptation.
==Difficulty== <!--T:32-->
==Difficulty== <!--T:32-->
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DC1 is a schedule of moderate difficulty. For naturally segmented sleepers, it is likely to be easier and more natural than E2. However, for others, E2 would be much easier, as it does not require SWS to be repartitioned. DC1 is known to be less flexible compared to E2, and as with all other Dual core schedules, it is much less tolerant to late cores.
DC1 is a schedule of moderate difficulty. For naturally segmented sleepers, it is likely to be easier and more natural than E2. However, for others, E2 would be much easier, as it does not require SWS to be repartitioned. DC1 is known to be less flexible compared to E2, and as with all other Dual core schedules, it is much less tolerant to late cores.
==Lifestyle Considerations== <!--T:34-->
==Lifestyle Considerations== <!--T:34-->
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With only a 2-cycle SWS core on the default variant, it may not fully accommodate the extra SWS need from intense exercise.
With only a 2-cycle SWS core on the default variant, it may not fully accommodate the extra SWS need from intense exercise.
==Variants== <!--T:40-->
==Variants== <!--T:40-->
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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.
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.
===Shortened cores and 30-minute naps=== <!--T:49-->
===Shortened cores and 30-minute naps=== <!--T:49-->
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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.
Note that these two variants are likely to be much more difficult than standard DC1 ("Hard" or "Very Hard" category), perhaps similar to Triphasic.
===Extended=== <!--T:52-->
===Extended=== <!--T:52-->
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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 [[Special:MyLanguage/DC2|DC2]] to as a route to adapt to [[Special:MyLanguage/Ducamayl|Ducamayl]].
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 [[Special:MyLanguage/DC2|DC2]] to as a route to adapt to [[Special:MyLanguage/Ducamayl|Ducamayl]].
===Longer post-core gap=== <!--T:56-->
===Longer post-core gap=== <!--T:56-->
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Similar to E2, the morning gap is suggested to be no longer than 7-8 hours. The evening gap can be up to about 9 hours, because sleep pressure is lower then.
Similar to E2, the morning gap is suggested to be no longer than 7-8 hours. The evening gap can be up to about 9 hours, because sleep pressure is lower then.
=== Core-nap flip=== <!--T:59-->
=== Core-nap flip=== <!--T:59-->
[[File:Siesta-alike.png|thumb|A DC1 (extended) variant with a core-nap flip|alt=]]
[[File:Siesta-alike.png|thumb|A DC1 (extended) variant with a core-nap flip|alt=]]
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 [[Special:MyLanguage/Siesta|Siesta]]. Attempts are very rare, and only one person is known to have successfully adapted to it.
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 [[Special:MyLanguage/Siesta|Siesta]]. Attempts are very rare, and only one person is known to have successfully adapted to it.
==References== <!--T:61-->
==References== <!--T:61-->
