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Critical Care Clinics
Sleep is a natural process occurring in animals and human beings. It isrna complicated state involving both behavioral and physiologic processes.rnSeveral brain centers are involved in the production and regulation of sleeprnusing a variety of hormones, neurotransmitters, and peptides. Sleep can berndifferentiated from coma by its reversibility. This article reviews the aspectsrnof normal sleep, physiologic changes that occur in the human body withrnsleep, and how sleep changes over the lifespan.
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