The Interpretation of Dreams by Sigmund Freud Chapter 6 Page 42

foreconscious, which is missing here, may be found in another place.

While the dominating system has withdrawn on the wish to sleep, the dream may bring to expression with manifold distortions a wish from the Unc., and realize this wish by producing the necessary changes of energy in the psychic apparatus, and may finally retain it through the entire duration of sleep.3

This persistent wish to sleep on the part of the foreconscious in general facilitates the formation of the dream. Let us refer to the dream of the father who, by the gleam of light from the death chamber, was brought to the conclusion that the body has been set on fire. We have shown that one of the psychic forces decisive in causing the father to form this conclusion, instead of being awakened by the gleam of light, was