Changes

{{TNT|DC2}}

Dual Core 2, or DC2, is the second dual core schedule, a logical upgrade from DC1 with the addition of 1 nap and some sleep reduction from the core sleeps. The total sleep of DC2 hovers around the hospitable zone for long-term sustenance, approximately ~5-5.5h of total sleep each day. {{TNT|DC2}}

== Mechanism ==

== Mechanism ==

Dual Core 2, or DC2, is the second dual core schedule, a logical upgrade from DC1 with the addition of 1 nap and some sleep reduction from the core sleeps. The total sleep of DC2 hovers around the hospitable zone for long-term sustenance, approximately ~5-5.5h of total sleep each day. With 2 core sleeps placed around the sleep peaks and 2 supplemental naps in the day, DC2 is similar to E3-extended in sleep distribution and offers a decent napping frequency to learn the napping behavior. '''DC2 in a way resembles E3''', except that the first nap of E3 is now the second core in DC2.  

With 2 core sleeps placed around the sleep peaks and 2 supplemental naps in the day, DC2 is similar to E3-extended in sleep distribution and offers a decent napping frequency to learn the napping behavior. '''DC2 in a way resembles E3''', except that the first nap of E3 is now the second core in DC2.  

The first core sleep is typically longer than the second core sleep to obtain an ideally sufficient amount of SWS, while the second core has a lot of room for REM sleep. With a 3h core (2 full cycles) in SWS peak hours, SWS is likely preserved after repartitioning is completed, and SWS deprivation symptoms on DC2 are overall a lot milder than schedules with only 1-cycle core sleeps around SWS peak/night hours. The naps provide more alertness boost to sustain the long wake gap in the day as the core duration becomes shorter, and meet the remaining REM sleep requirements. The second nap on DC2 may not give any REM sleep, and just NREM2 or trace SWS instead if it is placed in mid/late afternoon (e.g, after ~4 PM). Because of the reduced total core duration compared to that of DC1, an extra nap has to be added to compensate for the reduced amount of REM sleep in the second core of DC2.  

The first core sleep is typically longer than the second core sleep to obtain an ideally sufficient amount of SWS, while the second core has a lot of room for REM sleep. With a 3h core (2 full cycles) in SWS peak hours, SWS is likely preserved after repartitioning is completed, and SWS deprivation symptoms on DC2 are overall a lot milder than schedules with only 1-cycle core sleeps around SWS peak/night hours. The naps provide more alertness boost to sustain the long wake gap in the day as the core duration becomes shorter, and meet the remaining REM sleep requirements. The second nap on DC2 may not give any REM sleep, and just NREM2 or trace SWS instead if it is placed in mid/late afternoon (e.g, after ~4 PM). Because of the reduced total core duration compared to that of DC1, an extra nap has to be added to compensate for the reduced amount of REM sleep in the second core of DC2.