Dream interpretations dates back to 3000-4000 B.C. where they were documented in clay tablets. It is said that people in primal societies were unable to distinguish between the dream world and reality.
They not only saw the dream world as an extension of reality, but the dream realm was a more powerful world.
Dreams seen as prophetic
Dreams were also seen as prophetic. People often looked to their dreams for signs of warning and advice. It was an oracle or omen from outside spirits, whether it was a message from a deity, from the dead or even the works of a demon.
Dreams often dictated the actions of political and military leaders and aided in diagnosis for the medicine men. Dreams were a vital clue for healers in what was wrong with the dreamer and used them to make a diagnosis.
People in ancient Greece and ancient China looked to their dreams for their next course of action
The 19th Century
In the early 19th century, dreams were dismissed as stemming from anxiety, a household noise or even indigestion. Hence there was really no meaning to it.
Later on in the 19th century, Sigmund Freud revived the importance of dreams and its significance and need for interpretation. He revolutionized the study of dreams along with others.