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Normal Sleep Sleep is a universal behavior that has been demonstrated in every animal species studied, from insects to mammals. It is one of the most significant of human behaviors, occupying roughly one-third of human life. Although the exact functions of sleep are still unknown, it is clearly necessary for survival because prolonged sleep deprivation leads to severe physical and cognitive impairment and, finally, death. Sleep is particularly relevant to psychiatry because sleep disturbances occur in virtually all psychiatric illnesses and are frequently part of the diagnostic criteria for specific disorders. The ancient Greeks ascribed the need for sleep to the god Hypnos (sleep) and his son Morpheus, also a creature of the night, who brought dreams in human forms. Dreams have played an important role in psychoanalysis. Freud believed dreams to be the “royal road to the unconscious.” Electrophysiology Of Sleep Sleep is made up of two physiological states: ◦non-rapid eye movement...
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