a poture of sleep with wakefulness and awareness
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Wakefulness and sleep
Wakefulness and sleep, or an activity/inactivity cycle, are universal phenomena of all living organisms, regulated by one or more clock genes. In higher animals, including mammals, sleep is more structured and includes both slow wave (SWS) and rapid eye movement (REM) sleep.
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The posterior hypothalamus plays a key role in the maintenance of the cortical activation that underlies wakefulness. Several systems originating in this part of the brain control the shift from wakefulness into sleep and sleep into wakefulness.
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