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== Mechanism ==
 
== Mechanism ==
The core sleep on E3, lasting for only ~3-3.5h (depending on scheduling), accounts for only 2 full sleep cycles. 4 hours of daily sleep is considered the [[Schedule overview#Minimum sleep threshold|bare minimum]] needed for most people to maintain 90m SWS and [[wikipedia:Rapid_eye_movement_sleep|REM]], and sometransitional light sleep.  
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The core sleep on E3, lasting for only ~3-3.5h (depending on scheduling), accounts for only 2 full sleep cycles. 4 hours of daily sleep is considered the [[Scheduling overview#Minimum sleep threshold|bare minimum]] needed for most people to maintain 90m SWS and [[wikipedia:Rapid_eye_movement_sleep|REM]], with some transitional light sleep.  
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The most important scheduling requirement is having the core cover the SWS peak, by starting it around 21-22 local solar time. Rotating the schedule further is very difficult, and requires strict [[circadian management]]. An ideal E3 schedule would have all of the SWS need covered in the core, along with some amount of REM.
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The most important scheduling tip is having the core cover the SWS peak, by starting it around 21-22 local solar time. Rotating the schedule further is very difficult, and requires strict [[circadian management]]. An ideal E3 schedule would have all of the SWS need covered in the core, along with some amount of REM.
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Because of the reduced total sleep, each nap on E3 will not [[wake time reduction|sustain wakefulness]] for a period as long as the naps on E2 or one of the extended variants with higher total sleep. The ideal wake gap from the core to the first nap is anywhere around 3-4h, 4-5h between the first 2 naps, and then up to ~6-7h for the last two wake gaps. In successful adaptations, the first two naps primarily contains REM, and the third nap may also contain mostly light sleep.  
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Because of the reduced total sleep, each nap on E3 will not [[wake time reduction|sustain wakefulness]] for a period as long as the naps on E2 or one of the extended variants with higher total sleep. The ideal wake gap from the core to the first nap is anywhere around 3-4h, 4-5h between the first 2 naps, and then up to ~6-7h for the last two wake gaps. In successful adaptations, the first two naps primarily contains REM, and the third nap may also contain mostly light sleep.
    
== Adaptation ==
 
== Adaptation ==
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