Polyphasic sleep is a term used to describe several alternative sleep patterns intended to reduce sleep time to 2–6 hours daily in order to achieve a better quality of sleep. This is achieved by spreading out sleep into short naps of around 15–30 minutes throughout the day, and in some variants, a core sleep period of a few hours at night.
The process of adapting to a polyphasic schedule can involve a mentally and physically very difficult one- to two-week transition period, especially for the variant known as
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sleep. Thereafter, independent testers claim to experience no apparent drop of cognition or alertness, despite the few hours of sleep attained each day. On the other hand, polyphasic sleep typically requires adhering to a rigid schedule, which makes it infeasible for many people.
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