The Interpretation of Dreams by Sigmund Freud Chapter 9 Page 9

this is the work of certain unconscious phantasies which have probably given in to sexual emotions, and that these phantasies come to expression not only in dreams but also in hysterical phobias and in other symptoms. If the dream continues and settles activities of the day and even brings to light valuable inspirations, we have only to subtract from it the dream disguise as a feat of dream-work and a mark of assistance from obscure forces in the depth of the mind (cf.

the devil in Tartini's sonata dream). The intellectual task as such must be attributed to the same psychic forces which perform all such tasks during the day. We are probably far too much inclined to over-estimate the conscious character even of intellectual and artistic productions. From the communications of some of the most highly productive