kindly tell me what is REM?

guys..will you please tell me about REM???
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REM sleep is associated with A physiological condition that is thought to take place if a individual is definitely lying down.
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"REM (rapid eye movement) sleep is characterized by an increase in heart rate, a rise in blood pressure, an increase in the rate of breathing, and, in males, erections. Dreams most often occur during this stage."
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