I think it is the reaction to their over-estimation in former times. Reconstruction of the past is notoriously difficult, but this much we may assume with certainty--if you will permit me the jest--that our ancestors of 3000 years ago and more, dreamed much in the way we do. As far as we know, all ancient peoples attached great importance to dreams and considered them of practical value. They drew omens for the future from dreams, sought premonitions in them. In those days, to the Greeks and all Orientals, a campaign without dream interpreters must have been as impossible as a campaign without an aviation scout to-day. When Alexander the Great undertook his campaign of conquests, the most famous dream interpreters were in attendance. The city of Tyrus, which was then still situated on an island, put up so fierce a resistance that Alexander considered the idea of raising the siege. Then he dreamed one night of a satyr dancing as if in triumph; and when he laid his dream before his interpreters he received the information that the victory over the city had been announced to him. He ordered the attack and took Tyrus. Among the Etruscans and the Romans other methods of discovering the future were in use, but the interpretation of dreams was practical and esteemed during the entire Hellenic-Roman period. Of the literature dealing with the topic at least the chief work has been preserved to us, namely, the book of Artemidoros of Daldis, who is supposed to have lived during the lifetime of the Emperor Hadrian. How it happened subsequently that the art of dream interpretation was lost and the dream fell into discredit, I cannot tell you. Enlightenment cannot have had much part in it, for the Dark Ages faithfully preserved things far more absurd than the ancient dream interpretation. The fact is, the interest in dreams gradually deteriorated into superstition, and could assert itself only among the ignorant. The latest misuse of dream interpretation in our day still tries to discover in dreams the numbers which are going to be drawn in the small lottery. On the other hand, the exact science of to-day has repeatedly dealt with dreams, but always only with the purpose of applying its physiological theories to the dream. By physicians, of course, the dream was considered as a non-psychic act, as the manifestation of somatic irritations in the psychic life. Binz (1876) pronounced the dream "a bodily process, in all cases useless, in many actually pathological, above which the world-soul and immortality are raised as high as the blue ether over the weed-grown sands of the lowest plain." Maury compared it with the irregular twitchings of St. Vitus' Dance in contrast to the co-ordinated movements of the normal person. An old comparison makes the content of the dream analogous to the tones which the "ten fingers of a musically illiterate person would bring forth if they ran over the keys of the instrument."