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Triphasic is the original and most popular [[Special:MyLanguage/Tri core|Tri core]] schedule, which consists of 3 [[Special:MyLanguage/Cores|core]] sleeps and no [[Special:MyLanguage/naps|naps]].
Triphasic is the original and most popular [[Special:MyLanguage/Tri core|Tri core]] schedule, which consists of 3 [[Special:MyLanguage/Cores|core]] sleeps and no [[Special:MyLanguage/naps|naps]].
== Origin== <!--T:2-->
== Origin== <!--T:2-->
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Leif Weaver proposed the schedule, adapted to it, and stayed on the schedule for several months.<ref name="leif" />
Leif Weaver proposed the schedule, adapted to it, and stayed on the schedule for several months.<ref name="leif" />
== Mechanism == <!--T:4-->
== Mechanism == <!--T:4-->
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As with [[Special:MyLanguage/Dual core|Dual core]], the evening core favors [[wikipedia:Slow-wave_sleep|SWS]], whereas the dawn/morning core favors [[wikipedia:Rapid_eye_movement_sleep|REM]] sleep. The daytime core contains mixed sleep stages.
As with [[Special:MyLanguage/Dual core|Dual core]], the evening core favors [[wikipedia:Slow-wave_sleep|SWS]], whereas the dawn/morning core favors [[wikipedia:Rapid_eye_movement_sleep|REM]] sleep. The daytime core contains mixed sleep stages.
== Adaptation == <!--T:7-->
== Adaptation == <!--T:7-->
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During adaptation, the first core will be difficult to wake from, because of possible SWS wakes, which may result in oversleeps. Likewise, the second core may also be difficult, particularly when REM deprivation has accumulated to high levels. The daytime core is likely the easiest to handle, and may naturally shorten after adaptation.
During adaptation, the first core will be difficult to wake from, because of possible SWS wakes, which may result in oversleeps. Likewise, the second core may also be difficult, particularly when REM deprivation has accumulated to high levels. The daytime core is likely the easiest to handle, and may naturally shorten after adaptation.
== Difficulty== <!--T:11-->
== Difficulty== <!--T:11-->
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The adaptation difficulty for triphasic (non-extended) is "very hard" due to its low total sleep and only having a one-cycle core in the SWS peak. It is significantly harder than [[Special:MyLanguage/E3|E3]], due to the need to split SWS over several cores as well as its longer gaps.
The adaptation difficulty for triphasic (non-extended) is "very hard" due to its low total sleep and only having a one-cycle core in the SWS peak. It is significantly harder than [[Special:MyLanguage/E3|E3]], due to the need to split SWS over several cores as well as its longer gaps.
== Lifestyle consideration == <!--T:13-->
== Lifestyle consideration == <!--T:13-->
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Aside from the non-equidistant Triphasic scheduling which has proven to be viable by a couple of sleepers, the most popular and widely successful version is the extended version.
Aside from the non-equidistant Triphasic scheduling which has proven to be viable by a couple of sleepers, the most popular and widely successful version is the extended version.
=== Extended === <!--T:18-->
=== Extended === <!--T:18-->
[[File:Triphasic-extended 2.png|thumb|Alternative triphasic-extended with a longer morning core]]
[[File:Triphasic-extended 2.png|thumb|Alternative triphasic-extended with a longer morning core]]
Alternatively, it may be possible to extend the morning core to 3h, which may allow for even more social events. However, this variant has no known successes to date. A sleeper with low SWS needs and high REM needs may find this variant easier.
Alternatively, it may be possible to extend the morning core to 3h, which may allow for even more social events. However, this variant has no known successes to date. A sleeper with low SWS needs and high REM needs may find this variant easier.
== References == <!--T:21-->
== References == <!--T:21-->
