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From Polyphasic Sleep Wiki
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, 3 years ago
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 [[Special:MyLanguage/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.