The Interpretation of Dreams by Sigmund Freud Chapter 7 Page 10

From certain personal experiences, I am myself inclined to believe that the dream-work often requires more than one day and one night to produce its result; if this be true, the extraordinary art manifested in the construction of the dream loses all its marvels. In my opinion, even the regard for comprehensibility as an occurrence of perception may take effect before the dream attracts consciousness to itself. To be sure, from now on the process is accelerated, as the dream is henceforth subjected to the same treatment as any other perception. It is like fireworks, which require hours of preparation and only a moment for ignition.

Through the dream-work the dream process now gains either sufficient intensity to attract consciousness to itself and arouse the foreconscious, which is quite independent of the time or