Changes

===Early rotation/pronap===

===Early rotation/pronap===

[[File:DC2 Early Rotation.png|thumb|A DC2 variant with the first nap around dawn|alt=]]

[[File:DC2 Early Rotation.png|thumb|A DC2 variant with the first nap around dawn|alt=]]

This variant rotates the whole schedule backward to earlier hours. The goal of this is to place 3 sleep blocks at night, leaving only one nap in the day. As a result, the core gap is also shorter. The first nap is placed at the usual position of the second core, resembling an [[Everyman]] schedule. The first core will likely cover most of the SWS, while the second core may be mixed (containing both SWS and REM, but likely more REM sleep). Both naps are more likely to contain REM sleep, which can boost dream recall.  

This variant rotates the whole schedule backward to earlier hours. The goal of this is to place 3 sleep blocks at night, leaving only one nap in the day. The core gap also becomes shorter. The first nap is placed in the morning, resembling an [[Everyman]] schedule. The first core will likely cover most of the SWS, while the second core may be mixed (containing both SWS and REM, but likely more REM sleep). Both naps are more likely to contain REM sleep, which can boost dream recall.  

In this variant the first nap can also be extended to become a [[pronap]] (30-40m) to better sustain wakefulness and provide more REM sleep. However, this variant has not been tested, with the obvious issue of the early first core conflicting with social time for most people.  

In this variant the first nap can also be extended to become a [[pronap]] (30-40m) to better sustain wakefulness and provide more REM sleep. However, this variant has not been tested, with the obvious issue of the early first core conflicting with daily life for most people.  

===Extended===

===Extended===

[[File:DC2-ext Base.png|thumb|alt=|A DC2-extended variant]]

[[File:DC2-ext Base.png|thumb|alt=|A DC2-extended variant]]

The second core can be extended to a 3h sleep. 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. The only advantage of this version is that the first core can be delayed to the last hours of SWS peak - meaning it is possible to schedule this core at 11 PM or later. 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).

The second core can be extended to a 3h sleep. People with high sleep requirements (especially in both REM sleep and SWS) may benefit from the extra sleep. The first core can also be delayed, starting possibly at midnight. However, DC2-extended has had few attempts, and virtually no success. DC1-extended and E2-extended are recommended instead, as both are easier to schedule, and no more difficult to adapt to.  

 

===TC1-alike ===

===TC1-alike ===

This is an experimental variant, proposed by [[User:Sekvanto|Sekvanto]]. Both cores have the same length of 2 hours. Three blocks of sleep are placed during the night hours: both cores and one of the naps. The second nap is placed midday. Such schedule resembles the structure of [[TC1]], replacing one of the cores with a nap and extending the remaining cores. This variant has fewer naps during the daytime, which potentially makes it more convenient socially for some. An early core may be an issue, on the other hand. Another benefit is a dawn nap, which may increase dream recall.

This is an experimental variant proposed by [[User:Sekvanto|Sekvanto]]. Both cores are 2 hours long and placed early so that the first nap can be placed in the morning. The second nap is placed around midday. This resembles [[TC1]], replacing one of the cores with a nap while extending the other cores. The dawn nap may increase dream recall. This variant has only one daytime nap, which may make it more convenient for some. Nonetheless, the early first core may pose an issue.

It should be noted that 2h [[cores]] are usually considered a bad choice since they are a bit longer than an average sleep cycle, which makes SWS wakes more possible. This schedule overall isn't popular and had only a couple of successful adaptations. However, 2h cores work for some, supposedly either by having extended sleep cycles or by getting more light sleep at the end of the cores.

Note that 2h [[cores]] are uncommon, as they are not a multiple of a typical cycle length and may induce difficult mid-cycle REM or SWS wakes. This variant also contains less sleep than the standard, which may make it more difficult. Not many attempts have been made, and there has been few successes.

==References==

==References==