ВОТ И БРИТАНЦЫ ПЫТАЛИСЬ ЭТУ СВЯЗЬ УСТАНОВИТЬ
dream (n.) Look up dream at Dictionary.com
mid-13c. in the sense "sequence of sensations passing through a sleeping person's mind" (also as a verb), probably related to O.N. draumr, Dan. drøm, Swed. dröm, O.S. drom "merriment, noise," O.Fris. dram "dream," 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 Germanic are Skt. druh- "seek to harm, injure," Avestan druz- "lie, deceive." But O.E. dream meant only "joy, mirth," also "music."

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 Old English 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" .