Changes

===Slightly modified core duration ===

===Slightly modified core duration ===

[[File:DC1-mod.png|thumb|Slightly shortened/extended cores]]

[[File:DC1-mod.png|thumb|Slightly shortened/extended cores]]

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

A slightly longer second core can account for a higher REM need. The higher total sleep also increases the potential to flex the cores after adaptation. This variant is considered viable, though the second core may or may not cause difficult wakes.  

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===

===Shortened cores and 30-minute naps===

[[File:DC1-30m.png|thumb|30min naps and shortened cores]]

[[File:DC1-30m.png|thumb|30min naps and shortened cores]]

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.  

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. Both attempts and adaptations have been rare, possibly because of the uncommon core lengths leading to difficult wakes.  

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===

===Extended===

[[File:DC1-ext.png|thumb|Two possible ways to extend DC1]]

[[File:DC1-ext.png|thumb|Two possible ways to extend DC1]]

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.   

Both of these variants over the years have reported a lot of success. They are more beginner-friendly, but offer less sleep reduction. Those with a higher monophasic baseline (~9h) are also recommended to attempt these variants.   

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.  

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.  

===Longer post-core gap===

===Longer post-core gap===

[[File:DC1 Long Morning Gap.png|thumb|A DC1 variant with 8h morning wake gap|alt=]]

[[File:DC1 Long Morning Gap.png|thumb|A DC1 variant with 8h morning wake gap|alt=]]

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.

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 needs may be more able to do this, as they can stay awake longer at a given total sleep time.

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.   

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===

=== Core-nap flip===

[[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 [[Siesta]]. Attempts are very rare, and only one person is known to have successfully adapted to it. This variant is not recommended.   

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.   

==References==

==References==