Dream. To imagine while sleeping. See Imagine.

The story of dreams is still little enough known. It is, however, important, not only in medicine, but also in metaphysics, due to the arguments of the idealists. In dreaming we have an internal sentiment of ourselves and sometimes even a delirium great enough to see some things outside of ourselves. We ourselves act willingly or not, and finally all the objects of dreams can be seen to be figments of our imagination. The things that strike us most strongly during the day appear to our soul while in repose; this is common enough, even in animals (since dogs dream like men do). The cause of dreams is thus all impressions—strong, frequent and powerful—in any case.

Diderot, Denis (ascribed by Jacques Proust). "Dream." The Encyclopedia of Diderot & d'Alembert Collaborative Translation Project.Translated by Steve Harris. Ann Arbor: Scholarly Publishing Office of the University of Michigan Library, 2007. http://hdl.handle.net/2027/spo.did2222.0000.879 (accessed [fill in today's date in the form April 18, 2009 and remove square brackets]). Originally published as "Rêve," Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers,14:223 (Paris, 1765).