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Core sleep

From Polyphasic Sleep

"Core sleep" is a sleep period sufficiently long for a monophasic sleeper to experience a full ultradian cycle. For most people, this must be at least 90 minutes, although some have reported that regular napping or past polyphasic sleeping can reduce the amount of time needed to experience a full sleep cycle.

The Everyman sleep schedule involves several short naps and a core sleep period that is a multiple of 90 minutes in length. Other polyphasic sleep schedules, such as Uberman and Dymaxion do not incorporate a core sleep; all of the naps are 30 minutes or less.