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=== Extended variant ===
=== Extended variant ===
[[File:DC2-ext Base.png|center|thumb]]
[[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).
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. 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).
== Lifestyle Considerations ==
== Lifestyle Considerations ==
In spite of the seemingly unnecessary sleep distribution across the day on DC2, it is actually viable to attempt this schedule, because of its ability to become flexible after adaptation, and even scheduling viability. For the most part, the first nap can be taken during a noon or lunch break (which is allowed in many workplaces) and the second nap can be taken after work (~4:30-5:30 PM). It is then possible to sustain 2 naps per day, with a consistent work schedules on weekdays for example.
Both core sleeps total '''at least 3 full sleep cycles''', and with the more efficient use of sleep peaks, DC2 is an underrated option to pick for some physical exercises. The second core, being safe from virtually any real-life interruptions at late hours, acts as a storage for REM sleep, which can in return boost alertness and performance before heading out to work or school. The second core, once adapted, can create a strong impression of a long, restful night sleep that is compacted down to only 90m sleep. Not only is REM sleep safer to be maintained on DC2 (compared to regular E3) but also the DC2 naps can sustain alertness after only a couple hours staying awake, replenishing the energy budget after a long morning at work/school and then another nap after work/school for extra recovery. This also indicates that DC2 is one of the few polyphasic schedules that can go well with mainstream 9-to-5 jobs '''as long as it is possible to take one nap in the middle of this work gap'''.
However, to ensure the naps have good quality, it can be tricky to plan the nap before lunch when the noon break window is too short to take both the nap and have lunch. In addition, many people can also sustain 1 daytime nap in the long run, so 2 naps may prove to be an arduous choice for long-term practice. This also calls for the viability of the '''early rotation/Pronap''' scheduling choice, at the cost of a complete sacrifice of social time in the evening. In the end, though, the first core sleep of DC2 (which is usually taken around ~9-10 PM, or at worst, 11 PM in rare cases) poses more hindrance for social life around these hours; this weakness is only mitigated on extended version, which is also outperformed by other extended schedules with the better niches they offer. Non-natural Segmented sleep habits or poor planning during the wake gap at night can quickly lead to boredom and boost the difficulty of the adaptation. Overall, even though DC2 possesses the flaws of a typical Dual Core schedule, it does offer decent variability and diversity in its scheduling potential.
