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E1 is the first [[Special:MyLanguage/Template:Polyphasic Sleep Schedules|schedule]] in the [[Special:MyLanguage/Everyman|Everyman]] line, which contains a long [[Special:MyLanguage/Cores|core]], usually with a length of 6 hours, and a short [[Special:MyLanguage/Naps|nap]]. However, E1 is mostly known as a [[Special:MyLanguage/biphasic|biphasic]] schedule, rather than an Everyman schedule because it only has two sleeps, and the overall mechanism resembles [[Special:MyLanguage/Siesta|Siesta]].<ref>Puredoxyk (2013). [https://www.amazon.com/Ubersleep-Nap-Based-Schedules-Polyphasic-Lifestyle-ebook/dp/B00E1XAD7W ''Ubersleep: Nap-Based Sleep Schedules and the Polyphasic Lifestyle'']. Retrieved 20 November 2020.</ref>

E1 is the first [[Special:MyLanguage/Template:Polyphasic Sleep Schedules|schedule]] in the [[Special:MyLanguage/Everyman|Everyman]] line, which contains a long [[Special:MyLanguage/Cores|core]], usually with a length of 6 hours, and a short [[Special:MyLanguage/Naps|nap]]. However, E1 is mostly known as a [[Special:MyLanguage/biphasic|biphasic]] schedule, rather than an Everyman schedule because it only has two sleeps, and the overall mechanism resembles [[Special:MyLanguage/Siesta|Siesta]].<ref>Puredoxyk (2013). [https://www.amazon.com/Ubersleep-Nap-Based-Schedules-Polyphasic-Lifestyle-ebook/dp/B00E1XAD7W ''Ubersleep: Nap-Based Sleep Schedules and the Polyphasic Lifestyle'']. Retrieved 20-11-2020.</ref>

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