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[[File:DC2-mod 2.png|center|thumb|A DC2 variant with extra sleep compression]]
[[File:DC2-mod 2.png|center|thumb|A DC2 variant with extra sleep compression]]
Similar to the Polyphasic Society's proposal of a possible DC2 variant, this DC2 variant stresses on the final goal once the adaptation is completed - to compress both core sleeps down to a '''multiple of 80m cycles''' (from 90m). The common approach would be to adapt to the original '''3-1.5''' standard combination, and then wait for the compression to occur, thanks to the frequency of sleep. It is not recommended to start an adaptation with this variant, however, because of the increased chance to run into SWS/REM wakes that give an excessive amount of sleep inertia that could be alleviated in the standard setup.
Similar to the Polyphasic Society's proposal of a possible DC2 variant, this DC2 variant stresses on the final goal once the adaptation is completed - to compress both core sleeps down to a '''multiple of 80m cycles''' (from 90m). The common approach would be to adapt to the original '''3-1.5''' standard combination, and then wait for the compression to occur, thanks to the frequency of sleep. It is not recommended to start an adaptation with this variant, however, because of the increased chance to run into SWS/REM wakes that give an excessive amount of sleep inertia that could be alleviated in the standard setup.
[[File:DC2-mod 3.png|center|thumb|A DC2-modified variant with the same sleep duration for both cores]]
This DC2 variant offers a somewhat higher total sleep than usual (not high enough to be grouped into the extended category), and both core sleeps last for 2.5h each. So far there has only been one success with this variant, however. The premise behind this variant is to '''provide some buffer total sleep to advance to DUCAMAYL''' with both cores becoming flexible. This example sets the consideration for appropriate core durations to ensure that they can receive some flexibility after adaptation. Because of the highly uncommon and ill-advised 2.5h core duration, beginners and inexperienced polyphasic sleepers should avoid this variant.
=== Early rotation/Pronap ===
=== Early rotation/Pronap ===
Alternatively, the first nap can be extended to become a '''Pronap''' (e.g, 30m) to better sustain wakefulness and provide more REM sleep for individuals with somewhat higher REM requirements, because the first nap is located in REM peak. The reason a Pronap can be used is that both core sleeps mostly cover all SWS needs, leaving basically no room for SWS to occur in this hypothetical Pronap. The Pronap can then yield better wakefulness sustaining, and can become flexible after adaptation. However, it is important to note that this is a new proposal for an alternate DC2 variation, and has not been tested. There is also little incentive to try out this early rotation/Pronap variants, because the first core is too early in the evening, and becomes socially liable for a lot of people.
Alternatively, the first nap can be extended to become a '''Pronap''' (e.g, 30m) to better sustain wakefulness and provide more REM sleep for individuals with somewhat higher REM requirements, because the first nap is located in REM peak. The reason a Pronap can be used is that both core sleeps mostly cover all SWS needs, leaving basically no room for SWS to occur in this hypothetical Pronap. The Pronap can then yield better wakefulness sustaining, and can become flexible after adaptation. However, it is important to note that this is a new proposal for an alternate DC2 variation, and has not been tested. There is also little incentive to try out this early rotation/Pronap variants, because the first core is too early in the evening, and becomes socially liable for a lot of people.
=== Extended variant ===
[[File:DC2-ext Base.png|center|thumb]]
DC2-extended simply extends the second core sleep by a full cycle, making it 3h total. This variant shares the same total sleep as E2-extended, with the exception of having 2 core sleeps. People with high sleep requirements (especially in both REM and SWS) can make use of the sleep frequency and the assistance from naps to meet the necessary vital sleep requirements. However, while looking realistic on paper, DC2-extended has never really reported any successes. It is also outclassed by '''E2-extended''', which is more convenient in scheduling, more success and an allegedly easier adaptation. While it is possible to schedule the first core to be 4.5h long and the second core to be 1.5h long (for more SWS recovery from intense exercising or high SWS requirement), DC2-extended is also shadowed by '''DC1-extended''', which has the same total sleep for both cores combined while only requiring 1 daytime nap (more comfortable to keep up long-term).
== Lifestyle Considerations ==
== Lifestyle Considerations ==
