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Biphasic sleep has been widely used historically, including [[Special:MyLanguage/Segmented|Segmented]] and schedules falling in between [[Special:MyLanguage/E1|E1]] and [[Special:MyLanguage/Siesta|Siesta]], in which which is supplied with a short [[Special:MyLanguage/Naps|nap]] / [[Special:MyLanguage/Cores|core]] midday. However, all of the schedules practiced are believed to not be strictly timed, as the clock is a recent invention. It is also believed that these schedules have been non-reducing, which allows this form of flexibility and resilience.
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