Etymology
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soporific (adj.)

"tending to produce sleep," 1680s, from French soporifique (17c.), formed in French from Latin sopor (genitive soporis) "deep sleep" (from PIE root *swep- "to sleep"). As a noun from 1722. Earlier as an adjective was soporiferous (1580s as "characterized by excessive sleep," c. 1600 as "soporific").

updated on May 25, 2017

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Definitions of soporific from WordNet
1
soporific (adj.)
sleep inducing;
Synonyms: soporiferous / somniferous / somnific / hypnogogic / hypnagogic
soporific (adj.)
inducing mental lethargy;
Synonyms: narcotic / soporiferous
2
soporific (n.)
a drug that induces sleep;
Synonyms: hypnotic
From wordnet.princeton.edu, not affiliated with etymonline.