hypno-

Proto-Indo-European root meaning "to sleep."

It forms all or part of: hypno-; hypnosis; hypnotic; hypnotism; insomnia; somni-; somnambulate; somniloquy; somnolence; somnolent; Somnus; sopor; soporific.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit svapnah, Avestan kvafna-, Greek hypnos, Latin somnus, Lithuanian sapnas, Old Church Slavonic sunu, Old Irish suan, Welsh hun "sleep;" Latin sopor "a deep sleep;" Old English swefn, Old Norse svefn "a dream."

also hypnopaedia, "sleep-learning," 1932, in "Brave New World," from hypno- "sleep" + ending derived from Greek paideia "education," from pais (genitive paidos) "child" (see pedo-).