The content and purpose of dreams are not yet understood, though they have been a topic of speculation and interest throughout recorded history.
Source : Wikipedia
Not only is the function of dreaming unknown (if there is one), but there isn't as yet an agreed definition of what it is.
Nevertheless, after several centuries of research, more than a dozen formal theories proposing reasons for dreaming have been proposed - including :
Some are complementary, others conflicting. None has been generally accepted.
Further info International Association for the Study of Dreams
Freudian theories of dreaming have not been included in the above list due to lack of any scientific validation.
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