The Interpretation of Dreams by Sigmund Freud Chapter 2 Page 28

which hitherto held the psychical stuff together become lost in this transformation to the dream content. The dream work takes on, as it were, only the essential content of the dream thoughts for elaboration. It is left to analysis to restore the connection which the dream work has destroyed.

The dream's means of expression must therefore be regarded as meager in comparison with those of our imagination, though the dream does not renounce all claims to the restitution of logical relation to the dream thoughts.

It rather succeeds with tolerable frequency in replacing these by formal characters of its own.

By reason of the undoubted connection existing between all the parts of dream thoughts, the dream is able to embody this matter into a single scene.