MonoCore-0-Shortened / Mono-Shortened

In people with RSR, mono may be shortened compared to the normal 7-9h and still be fully restorative (at the very least with DP). In the general population however, Mono-Shortened does not work.

MonoSho is any monophasic sleep below 7h, though above 6h may still "work" for some average sleepers, with them being in a constant stage-2.

Reasons why it doesn't work

The following are several reasons identified within polyphasic theory that would make Monosho impossible for a reducing schedule:

1. Homeostatic pressure: One of polyphasic sleep’s main mechanisms is distribution of homeostatic pressure, which increases over time as one stays awake and makes them more and more tired. This distribution cannot happen [as well] on Mono-Shortened (specifically only when shortened compared to your sleep-requirement).
2. Lack of repartitioning: The body doesn’t change the core cycles themselves very much when on a pure monophasic schedule. This leads to light-sleep remaining high and vitals (REM and SWS) lacking, and therefore sleep deprivation. Even though this causes rebounds, they are much less effective on monophasic schedules because they only really take effect within the first 20 minutes of a sleep. (In people with RSR, no repartitioning is necessary however.)
3. Alignment: Unlike with polyphasic sleep, a shortened core cannot align with both the SWS and the REM peaks. This combines with the lack of repartitioning and causes even more light-sleep.
4. Cycle efficiencies: The first cycle (90m) in a block of sleep is usually the most effective at restoring your vitals. With polyphasic sleep, you have these first-cycles many times per day instead of just once for mono.