Dr. Butler says there are many scientific theories for why we dream: ... “Activation-synthesis hypothesis suggests dreams are caused by brainstem activation during rapid eye movement (REM) sleep and stimulation of the limbic system (emotional motor system),” she says.
The theory states that dreams don't actually mean anything. Instead they're merely electrical brain impulses that pull random thoughts and imagery from our memories. ...
This is why Freud studied dreams to understand the unconscious mind. Therefore, according to Freud, your dreams reveal your repressed wishes to you.
Good, healthy sleep means feeling rested upon waking. It means not having chronic bad dreams or nightmares. ... According to a group of French researchers writing in the Journal of Sleep Research, all people dream when they sleep, even people who think they don't.
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