I'm totally going to sound pedantic, but everyone dreams (ok, I'm sure there's some extremely rare disorder where people don't dream, but for the purposes of this statement...) though some people rarely remember their dreams. I have very vivid dreams every night, often multiple dreams a night. And I'm like Atreyu and dream even if I fall asleep for 20 mins.
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Not only does everyone dream, but everyone also has several episodes of dreams every night of sleep. Generally, the ability to recall a dream is tied to whether or not you wake up after having the dream or not. In other words, if you wake during or immediately after a dream occurs, chances are you will remember it and if you sleep through it, you probably will not. Some people can remember their dreams vividly for extended periods of time, and others forget them rather quickly.
People who believe they do not dream or enter REM sleep are simply not remembering their dreams. There are psychological reasons as to why the mind would actually not allow a person to remember a particular dream. An example would be when a particular dream is so intensely real that the person who had the dream would not be able to discern whether or not it actually occurred. This type of gray area between dreams and reality could lead to harm if a person allowed him or herself to believe that their dream was reality. What if they dreamed that they could walk off of a cliff and fly? In this example, the mind is better off shutting down memories of the dream rather than allowing reality to be blurred to the point of bodily harm or even death.
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http://www.wisegeek.com/does-everyone-dream.htm
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