Collect more facts about sleep. Present your facts to the class
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8tsurdirdurdtiidj
During sleep, a person periodically alternating two main phases: slow and fast sleep, and in the beginning of the sleep duration prevails slow phase, and before awakening - increasing the duration of REM sleep. Polysomnography showed that sleep most people consists of 4-6 wavelike cycles, lasting 80-100 minutes.
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