Oneiromancy (from the Greek: όνειροϛ, romanized: oneiros, lit. 'dream', and μαντεία, manteia, 'prophecy') is a form of divination based upon dreams, and also uses dreams to predict the future. Oneirogen plants may also be used to produce or enhance dream-like states of consciousness. Occasionally, the dreamer feels as if they are transported to another time or place, and this is offered as evidence they are in fact providing divine information upon their return.