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From Polyphasic Sleep Wiki
Mass deletion of english translations
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Cores are longer blocks of sleep that contain one or more full sleep cycles. They are important for gaining deep sleep (SWS).
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<div lang="en" dir="ltr" class="mw-content-ltr">
Cores are longer blocks of sleep that contain one or more full sleep cycles. They are important for gaining deep sleep (SWS).
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