Sleep is a condition of temporary unconsciousness; it is disturbed when one is stimulated. Circadian rhythm is one of the body functions that are used to regulate the sleep–wake cycles. Sleep is different from that of prolonged coma and animal hibernation. Sleep triggers inhibition of muscle activities. Sleep is recorded in EEG that shows four levels of sleep. If a person reading a novel goes to sleep, this occurs gradually and reaches the rapid eye movement (REM) sleep with a dream.

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Chapter 14.5, Problem 21BYGO

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Sleep is a condition of temporary unconsciousness; it is disturbed when one is stimulated. Circadian rhythm is one of the body functions that are used to regulate the sleep–wake cycles. Sleep is different from that of prolonged coma and animal hibernation. Sleep triggers inhibition of muscle activities. Sleep is recorded in EEG that shows four levels of sleep. If a person reading a novel goes to sleep, this occurs gradually and reaches the rapid eye movement (REM) sleep with a dream.

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