MonoCore-0 / Monophasic

Mono refers to this schedule (M0), NOT the MonoCore lineup.

Monophasic sleep is, together with DC0-Extended and Siesta-Extended (though also possibly others) one of the natural sleeping patterns of humans. It reached widespread adoption in the western world during the industrial revolution, as a result of unforgiving jobs with long hours, where DC0e used to be more common.

TST	8h ± 1h
Cores	1
Naps	0
Difficulty	0 / 5
RSR Difficulty	0-1 / 5
Flex-potential	Natural

Variant links: M0-Extended M0-Shortened M0-Recovery
Related: MX DC0

Mechanism

Six (usually) core cycles, each containing all sleep stages, restore all of the required sleep for a day within a single phase.

Difficulty

Some people may have trouble with mono/M0, which can be due to being pre-programmed for biphasic sleep (usually DC0ext). Other times, the environment may not be conducive to consistent mono or not allow for one sleep phase of enough length at once. Sleep quality on polyphasic schedules tends to be significantly higher than on M0, even if TST remains the same.

However, Mono is one of the few schedules that RSR individuals tend to report more problems with than the general population. Timing can drift over time (much like in N24) or symptoms of both oversleeping and undersleeping may be present at the same time.