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Why do humans dream?

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   This question had been thought battle in many minds but no perfect solution had been attained in clarifying it.     Many theories including Neuropsychological studies  had been put forward ages back, to explain the mystery of dreams in human.     But this site is going to limit her theories to some questions asked by humans on dreams which are related to Neuropsychological studies.     The first theory made by some groups of neuropsychologist stated that dreams are due to rapid eye movement (REM) cycle which occurs at night causing activeness in the brain, which leads to regeneration of brain wave causing transmission of some neutrochemicals stored in the cortex of the brain, so during such period , it is expressed in the form of dreams.         Futher Neuroscience study reveals that dreams had no scientific and biological function . This statement became a point of argument among scientist of that time. Others believe that it is an Epiphenomenon ( which simply means tha