Phantasy

"Phantasy, or imagination, which some call estimative, or cogitative ... is an inner sense which doth more fully examine the species perceived by common sense, of things present or absent, and keeps them longer, recalling them to mind again, or making new of his own. In time of sleep this faculty is free, and many times conceive strange, stupend, absurd shapes, as in sick men we commonly observe. His organ is the middle cell of the brain; his objects all the species communicated to him by the common sense, by comparison of which he feigns infinite other unto himself. In melancholy men this faculty is most powerful and strong, and often hurts, producing many monstrous and prodigious things, especially if it be stirred up by some terrible object, presented to it from common sense or memory. In poets and painters imagination forcibly works, as appears by their several fictions, antics, images: as Ovid's house of sleep, Psyche's palace in Apuleius, &c. In men it is subject and governed by reason, or at least should be; but in brutes it hath no superior, and is ratio brutorum, all the reason they have."

-- Robert Burton "The Anatomy of Melancholy"

"Many's the long night I've dreamed of cheese -- toasted, mostly."

-- (Ben Gunn) R.L. Stevenson "Treasure Island"