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rem sleep
Rapi eye movement (REM) sleep is normal stage of sleep characterized by rapid movements of the eyes. REM sleep is classified into two categories: tonic and phasic. It was discovered by Kleitman and Aserinsky in the early 1950s (see below).
Trivia about rem sleep
(Cheryl of the Clue Crew monitors a sleep study at the Sleep Research Center at Stanford University.) Doctors for this center linked dreaming with this phase of sleep that includes higher heart & respiration rates
Michael Stipe knows this type of sleep occurs about every 90 minutes & lasts from 5 to 30 minutes
Normally, the periods of this type of sleep are short early in the night, then lengthen