Sigmund Freud quote #34 from The Interpretation of Dreams
The dream has a very striking way of dealing with the category of opposites and contradictions. This is simply disregarded. To the dream No does not seem to exist. In particular it prefers to draw opposites together into a unity or to represent them as one. Indeed it also takes the liberty of representing some random element by its wished-for opposite so that at first one cannot tell which of the possible poles is meant positively or negatively in the dream-thoughts.