DualCore-1

DC1 is a schedule with two cores and one nap, based on DC0. It is the equivalent to M1 for those who prefer a night gap and/or are naturally segmented sleepers.

TST	5h20
Cores	2: 3h20, 1h40
Naps	1 @ 20min
Difficulty	2-3 / 5
RSR Difficulty	1-2 / 5
Flex-potential	Moderate to Low?

Mechanism

DC1 works very similarly to a mix of DC0 and M1. The first core is around the SWS peak for maximum SWS gain there, and the second is around REM peak to maximize REM. This allows for a slightly lower sleep total than M1 due to more efficient cores. The nap around the early afternoon works largely as a way to restock on light-sleep and avoid the ls-pressure that would otherwise make the afternoon difficult. This pressure management makes for a higher baseline pressure but without peaks into uncomfortable territory, like most other reducing schedules.

The nap may also contain REM, depending on individual needs.

Difficulty

For non- natural segmented sleepers, this schedule is likely more difficult than M1, and closer to or harder than M2 instead. On the other hand, natural segmented sleepers will find it much easier than M1. The difficulty mostly comes from partitioning the vitals into the two cores instead of having them be quite mixed in one long core. As such, the advantage of nat. segmented sleepers arises.

Scheduling headroom

Scheduling headroom does not refer to flexing. Once chosen, Consistency within the schedule remains a requirement. All schedules can be rotated arbitrarily with sufficient dark-period and light period.

The cores are relatively inflexible and should only be moved by about one hour to retain peak alignment. The nap can however be moved somewhat more freely, about 2h back and 1h forward. This is to retain alignment with the midday alertness dip.