Oneiromancy

Oneiromancy is a form of divination based upon dreams; it is a system of dream interpretation that uses dreams to predict the future.

Classical
Aristotle and Plato discuss dreams in various works. Artemidorus gives a list of authors mentioned in his Oneirocritica, the longest of the ancient dreambooks. All of the referenced works are lost, but fragments are preserved in Artemidorus and other ancient authors. Achmet wrote an edition of Artemidorus' Oneirocritica in addition to his own. Astrampsychus was the pseudonymous author of a number of divinatory, magical and medical works, including an Oneirocriticon.