Etymology
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Words related to hypnosis

hypnotism (n.)

1843, short for neuro-hypnotism (1842), coined by Dr. James Braid of Manchester, England, from hypnotic + -ism. In the same work (1843) Braid coined the verb hypnotize.

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hypno- 

word-forming element meaning "sleep," from Greek hypnos "sleep," from PIE *supno-, suffixed form of root *swep- "to sleep."

-osis 

word-forming element expressing state or condition, in medical terminology denoting "a state of disease," from Latin -osis and directly from Greek -osis, formed from the aorist of verbs ending in -o. It corresponds to Latin -atio.

braidism (n.)

"hypnotism," 1849, from the name of hypnosis pioneer Dr. James Braid (see hypnosis).

*swep- 

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."