Changes

== Possible variations ==

== Possible variations ==

=== Extended sleep cycles ===

=== Extended sleep cycles ===

This option is considered standard. It usually has 3h20m first core and 1h40m second core, theoretically making sleep cycles a bit longer (close to 100m). In fact, according to EEG readings of some community members, sometimes cycle lenght might be unchanged and be shorter, so there is more LNREM inserted in the end of cores.

This option is considered standard. It usually has 3h20m first core and 1h40m second core, theoretically making sleep cycles a bit longer (close to 100m). In fact, according to EEG readings of some community members, sometimes cycle lenght might be unchanged and shorter, so there is more LNREM inserted in the end of cores.<ref>[https://www.imgurupload.com/uploads/20201117/13e019f96f652f0ec610a4fc9f1827c99510151b.jpg Zeo reading of a shorter core]</ref><ref>[https://www.imgurupload.com/uploads/20201117/5b634c74a7ea495e7158299c35f303c47375b86c.jpg longer core]</ref>

=== Standard sleep cycles ===

=== Standard sleep cycles ===

=== Equal core length ===

=== Equal core length ===

Both cores are of the same lenght. This variation is viable, but rare. It is also considered more difficult than the standard one, since requires sleep cycle compression.

Both cores are of the same length. This variation is viable, but rare. It is also considered more difficult than the standard one, since requires sleep cycle compression.

=== Swapped cores ===

=== Swapped cores ===

In this variation the first core is swapped with the second one. The difficulty is also higher, because of the possible SWS wakes and the need for SWS splitting, which is easier for either experienced polyphasic sleepers, or

In this variation the first core is swapped with the second one. The difficulty is also higher, because of the possible SWS wakes and the need for SWS splitting, which is easier for either experienced polyphasic sleepers, or