Changes

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.  

In addition, DC2 is also a middle ground between the easier DC1 and the advanced DC3. The total sleep is not as high as DC1-extended and not as low as DC3, which is '''a favorable zone of total sleep for flexing sleep after adaptation'''. The total sleep is equivalent to E2, but the splitting of core sleeps will provide a deeper core experience for the first core, and high likelihood for vivid/lucid dreaming in the second core as SWS is met in the first core. The wake gap between 2 cores is also large enough for certain favorite nighttime activities, including certain brainstorming or somewhat mentally taxing duties without having to worry about cooling down for the second core around sunrise hours too soon. 4 sleeps per day also renders the wake gap between each sleep more manageable than on E2 for instance. Skipping one nap as a result may be tolerable during adaptation, as long as this does not happen too often.  

In addition, DC2 is also a middle ground between the easier DC1 and the advanced DC3. The total sleep is not as high as DC1-extended and not as low as DC3, which is '''a favorable zone of total sleep for flexing sleep after adaptation'''. The total sleep is equivalent to E2, but the splitting of core sleeps will provide a deeper core experience for the first core, and high likelihood for vivid/lucid dreaming in the second core as SWS is met in the first core. The wake gap between 2 cores is also large enough for certain favorite nighttime activities, including certain brainstorming or somewhat mentally taxing duties without having to worry about cooling down for the second core around sunrise hours too soon. It is also possible to have a 5-6h wake gap from the morning core to the first nap, and another ~4-5h to the second nap. 4 sleeps per day also renders the wake gap between each sleep more manageable than on E2 for instance. Skipping one nap as a result may be tolerable during adaptation, as long as this does not happen too often.  

== Adaptation ==

== Adaptation ==