DC1
DC1 is a schedule which logically follows Segmented sleep, shortening its core (usually the second one) and adding a nap to compensate for the lost REM.
| Dual Core 1 | |
|---|---|
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| Total sleep | 5 hours 20 minutes |
| Proposed by | Polyphasic Society |
| Difficulty | Moderate |
| Specification | 2 core sleeps, 1 nap |
Possible variants
Extended sleep cycles
This variant 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 length might be unchanged and shorter, so there is more LNREM inserted in the end of cores.[1][2] The other possible standard variant is 3.5h + 1.5h, it might be a bit more difficult, but is also quite popular.
Standard sleep cycles
This variant has standard cores' length, 3h + 1.5h. It 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.
Equal core length
Both cores are of the same length, 2.5h + 2.5h. This variant is viable, but rare. It is also considered more difficult than the standard one, since requires sleep cycle compression.
Swapped cores
In this variant the first core is swapped with the second one. The difficulty is also higher, because of the possible SWS wakes and the need for SWS splitting, which is easier for either experienced polyphasic sleepers or those with lower SWS sleep requirements.
Extended
The easiest and the most popular one, which has several variants. Usually 3h + 3h or 4.5h + 1.5h core variants are used, but other ones 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 variant fits adolescents or those with higher sleep requirements.
Shortened
This variant has only 2 sleep cycles, for example 1.5h + 1.5h or 2h + 2h. Is much harder and recommended only for those with lower sleep needs, 6h mono or less. It allows for much less LNREM/REM.
