Sleep is controlled largely by nerve centers in the lower brain stem, where the metrical foot of the brain joins the spinal cord. It is here where certain nerve cells take a leak chemicals, which control and regulate the two alternating states of sleep: speedy Eye Movement Sleep (REM) and Slow Wave Sleep (SWS). REM sleep is sleep where the eyes move very rapidly. This type of sleep occurs periodically (about every 90 minutes), and occupi...If you wish to get a full essay, order it on our website: Ordercustompaper.com
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