Dreaming is the subjective experience of involuntary imaginary images, thoughts or sensations during sleep. Dreaming is associated with rapid eye movement, (REM) sleep, a lighter form of sleep that occurs during the later portion of the sleep cycle.
True dreaming has only been confirmed in homo sapiens sapiens, but many believe that dreaming occurs in other animals. Animals certainly undergo REM sleep, but their subjective experience is difficult to determine. The animal with the most periods of REM sleep is the armadillo.
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