Changes

== Mechanism ==

== Mechanism ==

DC1's mechanisms largely carry on from the original Segmented sleep. Each core sleep is located around each respective sleep peak to further consolidate the overall sleep structure. The first core may remain around the same length or some slight reduction compared to the first core of Segmented sleep, to preserve the amount of SWS, while the second core is reduced in length so that REM can be alleviated in the nap. The nap also serves to bridge the long daytime wake gap which has increased because of the reduced total sleep from both cores combined. However, the nap on DC1 does not always guarantee a high percentage of REM sleep. For some attempters, it '''only contains NREM2''', or very small amount of REM, especially if the nap is placed somewhat late in the afternoon (after ~3 PM). Despite all that, the nap can sustain alertness for a long time until the first core (~7-8h) , because it is generally easier to stay awake in the day than during the night (~4-5h between 2 cores).  

DC1's mechanisms largely carry on from the original Segmented sleep. Each core sleep is located around each respective sleep peak to further consolidate the overall sleep structure. The first core may remain around the same length or some slight reduction compared to the first core of Segmented sleep, to preserve the amount of SWS, while the second core is reduced in length so that REM can be alleviated in the nap. There have been some changes in DC1's scheduling proposals over the years, and now the standard variant is recommended to have a core sleep of 3h20m and 1h40m respectively. The cycle length does not follow the common 90m rules mostly because of the effects of sleep peaks, which ''may'' lengthen the cycles of the dominant sleep stage in the peak (e.g, longer REM cycle around REM peak and longer SWS cycle around SWS peak). 

 

The nap also serves to bridge the long daytime wake gap which has increased because of the reduced total sleep from both cores combined. It is also placed in the '''circadian nadir''' around noon and early afternoon, which can give a familiar sense of daytime napping on E1 and Siesta. Alertness dips often occur around these hours, so DC1's nap takes advantage of the natural energy dips to facilitate napping. However, the nap on DC1 does not always guarantee a high percentage of REM sleep. For some attempters, it '''only contains NREM2''', or very small amount of REM, especially if the nap is placed somewhat late in the afternoon (after ~3 PM). Despite all that, the nap can sustain alertness for a long time until the first core (~7-8h) , because it is generally easier to stay awake in the day than during the night (~4-5h between 2 cores).  

DC1 is often compared to '''E2''', because both of them are the first schedules in their respective schedule series (Dual Core & Everyman). They have a similar amount of total sleep and the same number of sleep blocks (3) per day. The only difference is that E2's first nap is now a core in DC1, and that DC1's first core is recommended to start earlier than E2 core.  

DC1 is often compared to '''E2''', because both of them are the first schedules in their respective schedule series (Dual Core & Everyman). They have a similar amount of total sleep and the same number of sleep blocks (3) per day. The only difference is that E2's first nap is now a core in DC1, and that DC1's first core is recommended to start earlier than E2 core.  

== Alternate variations ==

== Alternate variations ==

Currently, there have been a few DC1 variants that have been successful, although success rate is still assessed as "Your Mileage May Vary". These alternate variants serve different purposes of different polyphasic adapters and have a varying success rate as reported.  

 

This option is considered standard. It usually has 3h20m first core and 1h40m second core, theoretically making sleep cycles a bit longer (close to 100m). In fact, according to EEG readings of some community members, sometimes cycle lenght might be unchanged and shorter, so there is more LNREM inserted in the end of cores.<ref>[https://www.imgurupload.com/uploads/20201117/13e019f96f652f0ec610a4fc9f1827c99510151b.jpg Zeo reading of a shorter core]</ref><ref>[https://www.imgurupload.com/uploads/20201117/5b634c74a7ea495e7158299c35f303c47375b86c.jpg longer core]</ref>

 

 

 

This variation is rarely used and has a lower success rate since cores contain less light sleep/REM. It is considered more difficult than the standard one, and usually fits people with lower natural monophasic sleep baseline, about 6-7 hours or less.

 

 

 

Both cores are of the same length. This variation is viable, but rare. It is also considered more difficult than the standard one, since requires sleep cycle compression.

 

=== Swapped cores ===

=== Less Common Core Length Combination ===

=== Extended ===

=== Extended/Non-reducing ===

The easiest and a popular option, which has several variations. Usually 3h+3h or 4.5h+1.5h core versions are used, but other options are also possible (e.g. 1.5h+4.5h or 3.5h+3.5h). It usually has 4 cycles instead of 3 (5 or more is also possible, but almost never is used). This variation fits adolescents or those with higher sleep requirements.

The easiest and a popular option, which has several variations. Usually 3h+3h or 4.5h+1.5h core versions are used, but other options are also possible (e.g. 1.5h+4.5h or 3.5h+3.5h). It usually has 4 cycles instead of 3 (5 or more is also possible, but almost never is used). This variation fits adolescents or those with higher sleep requirements.

== Lifestyle Considerations ==

== Lifestyle Considerations ==