In an essay by the French alienist Jacques-Joseph Moreau de Tours (1804-1884), published posthumously in 1899, hallucinations are defined as follows: "The hallucination, like all other delirious phenomena, belongs to the dream-life; it is the sensation ofthe dream state, reproduced during the waking state."
References
Moreau de Tours, J.-J. (1899). Quelques notes sur les hallucinations. Paris: Société d'Éditions Scientifiques.
Dictionary of Hallucinations. J.D. Blom. 2010.