Changes

Once adapted, it is possible to occasionally increase or decrease the length of the core by 90 minutes (or another presumed cycle length). Nap amounts can increase or decrease to help offset the tiredness. After this shortened- or lengthened core, a week should be given to allow the core to remain stable.

Once adapted, it is possible to occasionally increase or decrease the length of the core by 90 minutes (or another presumed cycle length). Nap amounts can increase or decrease to help offset the tiredness. After this shortened- or lengthened core, a week should be given to allow the core to remain stable.

SEVAMAYL represents a final form of polyphasic sleep, with a reduced sleep total that saves many hours every week, while also maximizing alertness all day, without having to stick to any strict sleep times. However, its difficulty lies in the length of time it takes for a successful adaptation, which can take several months to complete. Daily scheduling needs to be stable for the first two or three months, before you can start attempting SEVAMAYL. Then, be prepared for as many as 7-9 additional weeks of adaptation to SEVAMAYL, most of which is phase 4 feeling “almost” but not quite refreshed or stable. Risk of oversleep remains, even as natural wakes become frequent.  While SEVAMAYL is more resilient in flexibility, it’s also prone to many of the same breakdowns as regular polyphasic schedules — it can be irreversibly destabilized by excess sleep due to illness, extreme emotional distress, or falling out of habit during a long vacation with monophasic sleepers. Severe injury or excessive flexing can also cause too many oversleeps and undo adaptation.

SEVAMAYL is regarded as an ultimate form of polyphasic sleep, allowing many waking extra hours, while also maximizing alertness, without having to stick to any strict sleep times. However, its difficulty lies in the length of time it takes for a successful adaptation, which can take several months to complete. Daily scheduling needs to be stable for the first two or so months, before SEVAMAYL can be attempted. Then, the adaptation to flexing naps and and changing nap count also takes another month or two, most of which would feel similar to [[4-Stages Adaptation Model#Stage 4|Stage 4]], where one feels mostly refreshed, but not quite. Risk of oversleep remains, even as natural wakes become frequent.  

 

Even with its flexibility, it still has many of the weaknesses of reducing polyphasic schedules in general: it can be destabilised by excess sleep due to illness, emotional distress, or when sleeping monophasically due to life circumstances. Severe injury or excessive flexing can also increase sleep needs, causing oversleeps and undo the adaptation.

 

While there are no "standard" variants of SEVAMAYL unlike with strict schedules, there are still different possible variants of the schedule. The difference between them is in the total core length and the overall average number of naps.  

The most common core length of SEVAMAYL is often scheduled to be 4.5 hours. This may naturally decrease to about 4 hours with cycle compression after a long time. Some, especially those with lower sleep needs, may be able to adapt to a 3.5-hour core, but most sleepers cannot gain much flexibility from the shorter core. On the other hand, a 6-hour core is also possible as a less extreme form of SEVAMAYL, though less popular. The dark period should stay consistent on a day-to-day basis, even if the nap/core timings change, to ensure a stable circadian rhythm.

The core length of SEVAMAYL is often scheduled to be 4.5 hours. This might naturally decrease to about 4 hours with cycle compression after a long time. Some, especially those with lower sleep needs, may be able to adapt to a 3.5-hour core, but most sleepers cannot gain much flexibility from the shorter core. On the other hand, a 6-hous core is also possible, though less popular. The dark period should stay consistent on a day-to-day basis, even if the nap/core timings change, to ensure a stable circadian rhythm.

{| class="wikitable"

{| class="wikitable"

!E4-extended

!E4-extended

!E3-extended

!E3-extended

!E2-extended

! E2-extended

|-

|-

|[[File:E4-extended.png|frameless]][https://napchart.com/42zjb chart link]

|[[File:E4-extended.png|frameless|alt=|250x250px]]

|[[File:E3-extended.png|frameless]]

[https://napchart.com/42zjb chart link]

|[[File:E3-extended.png|frameless|alt=|250x250px]]

[https://napchart.com/5rhhz chart link]

[https://napchart.com/5rhhz chart link]

|[[File:E2-extended.png|frameless]]

|[[File:E2-extended.png|frameless|alt=|250x250px]]

[https://napchart.com/ddxjb chart link]

|}

|}

Compared to standard Everyman schedules, SEVAMAYL requires extra naps to be adaptable. While SEVAMAYL does not have a set number of naps, it still roughly follows the number of naps in the base schedule, as the amount of REM that needs to be accounted for in the naps stays relatively constant. The core should be placed in during the night, and the scheduling range depends on the variant of SEVAMAYL:

Compared to standard Everyman schedules, SEVAMAYL requires extra naps to be adaptable. While SEVAMAYL does not have a set number of naps, it still roughly follows the number of naps in the base schedule, as the amount of REM that needs to be accounted for in the naps stays relatively constant. The core should be placed in during the night, and the scheduling range depends on the variant of SEVAMAYL.

{| class="wikitable"

{| class="wikitable"

|Core length

!Core length

| Start of core range (solar time)

!Start of core range ([[Circadian management#Circadian structure|solar time]])

|-

|-

|3.5 hours

|3.5 hours

|-

|-

|6 hours

|6 hours

| 18 – 03

|18 – 03

|}

|}

==References ==

==References==

{{reflist|refs=

{{reflist|refs=

<ref name="polynet">{{cite web |url=https://web.archive.org/web/20201126222239/https://www.polyphasic.net/schedules/sevamayl/ |title=SEVAMAYL |website=polyphasic.net |access-date=2020-11-19}}</ref>

<ref name="polynet">{{cite web |url=https://web.archive.org/web/20201126222239/https://www.polyphasic.net/schedules/sevamayl/ |title=SEVAMAYL |website=polyphasic.net |access-date=2020-11-19}}</ref>