c.1250 in the sense "sequence of sensations passing through a sleeping person's mind," probably related to O.N. draumr, Dan. drøm, Swed. drom, O.S. drom, Du. droom, O.H.G. troum, Ger. traum "dream," perhaps from W.Gmc. *draugmas "deception, illusion, phantasm" (cf. O.S. bidriogan, O.H.G. triogan, Ger. trügen "to deceive, delude," O.N. draugr "ghost, apparition"). Possible cognates outside Gmc. are Skt. druh- "seek to harm, injure," Avestan druz- "lie, deceive." But O.E. dream meant only "joy, mirth," also "music." Words for "sleeping vision" in O.E. were mæting and swefn (from PIE *swep-no-, cf. Gk. hypnos). Much study has failed to prove that O.E. dream "noisy merriment" is the root of the modern word for "sleeping vision," despite being identical in spelling. Either the meaning of the word changed dramatically or "vision" was an unrecorded secondary O.E. meaning of dream, or there are two separate words here. "It seems as if the presence of dream 'joy, mirth, music,' had caused dream 'dream' to be avoided, at least in literature, and swefn, lit. 'sleep,' to be substituted" [OED]. Dream in the sense of "ideal or aspiration" is from 1931, from earlier sense of "something of dream-like beauty or charm" (1888). Dreamy is 1567 in the sense "full of dreams;" 1941 as "perfect, ideal." Dreamboat "romantically desirable person" is from 1947. Dreamland is c.1834; dreamscape is 1959, in a Sylvia Plath poem.