"Sleep", which removes mental and physical fatigue, increases immunity, organizes memories, ensures the efficient functioning of the brain and has an important place for our lives, does these not only limited to, but also enables us to see dream.
People today have become very selective about interpreting the meaning of their dreams, they are more likely to believe and assign meaningful symbols to dreams, which are in line with their daily lives. This phenomenon is called motivated reasoning. Motivated reasoning is an emotion based decision making phenomenon.
Dream interpretation, in the sense of foretelling the future or discerning the will of gods or ancestors, is as old as human history. The Summerian civilization, which was the first to develop writing in the third millennium BC, recorded dreams their earliest texts. For instance, in the Gilgamesh epic, the bull-man Enkidu has a pair of dreams which foretell his death. Egyptian papyri and other early civilizations writings feature this type of interpretation.
The earliest recorded attempt at dream interpretation, comes from the Babylonian epic, "Epic of Gilgamesh" where mother of Gilgamesh helps him in interpretating his dreams.