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==Minimum sleep threshold==
==Minimum sleep threshold==
Since vital sleep stages are generally not possible to reduce, the amount of compression required to sustain a schedule increases dramatically as total sleep time reduces. Compressing sleep, however, requires adaptation, and greater levels of compression necessitates harsher and/or longer adaptations. As such, schedules can be classified by their difficulty level, which is mostly a function of the amount of sleep cut.
The necessity of vital sleep stages also implies that certain schedules, such as Uberman or Dymaxion, will be unachieveable for most people as its total sleep is below the total vital sleep required for most people.
Here is a basic classifcation of schedules by their difficulty level, assuming a typical sleeper with 8h monophasic sleep and normal levels of SWS and REM:
{| class="wikitable"
|+
!Difficulty
!Example schedules
!TST range
!Sleep time cut
!Note
|-
|Easy
|BiphasicX, E1-ext,
Siesta-ext, Segmented-ext
|7-9
|Negligible
|
|-
|Moderate
|E1, E2, E3-ext, Siesta, DC1, Triphasic-ext,
Segmented, DC1-ext
|5-6
|1-2 hours
|
|-
|Hard
|E3, DC2, Triphasic
|4-5
|2-3 hours
|
|-
|Very hard
|DC3, Bimaxion
|4
|3-4 hours
|
|-
|Extremely hard
|E4, E3-shortened, Uberman, Dymaxion
|<4
|>4 hours
|
|}
==Sleep block lengths==
==Sleep block lengths==
