Rapid Eye Movement or REM is defined by Wikipedia as a normal stage of sleep characterized by the random movement of the eyes. Usually, REM happens in the first 90 minutes of sleep. The stages of REM deepen as you enter from stage to stage. Usually during REM, your body goes into a state of paralysis and certain neurotransmitters are shut down together with some of your large muscles.
Some people have abnormal REM sleep where the neurotransmitters do not shut down and they begin to act out their dreams. Most people tend to remember their dreams during REM as the brain activity is much more during this period.
Usually, REM sleep occurs 90 minutes after sleep begins. The first period of REM typically lasts 10 minutes, with each recurring REM stage lengthening, and the final one lasting up to an hour. Polysomnograms show brainwave patterns in REM to be similar to that recorded during wakefulness. In people without sleep disorders, heart rate and respiration speed up and become erratic during REM sleep. During this stage the eyes move rapidly in different directions.
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