The Greek word oneiromancy means dream interpretation as a type of foretelling the future. Oneiros means dream and manteia means prophecy. Carl G. Jung the founder of analytical psychology and Swiss psychiatrist plus many others styled and cast their forms of dream interpretation around oneiromancy. Since ancient times devination was based upon dreams and the dream world.
There is an ancient and unique example from the pre-Hellenistic Egyption era called “Ramesside Dream-book,” which was translated into English by Kasia Szpakowska.
The famous Epic of Gilgameah demonstrated the value of the ancients to view dreams as a way of predicting the future by sleeping on issues to gain insight and information to make personally informed decisions.