soporiferous

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so·po·rif·ic

(sō'pō-rif'ik),
1. Causing sleep. Synonym(s): somnifacient, somniferous, somnific, soporiferous
2. Synonym(s): hypnotic (2)
[L. sopor, deep sleep, + facio, to make]

soporiferous

(sŏp′ə-rĭf′ər-əs, sō′pə-)
adj.
Inducing or tending to induce sleep; soporific.

sop′o·rif′er·ous·ly adv.
sop′o·rif′er·ous·ness n.

soporiferous

[sop′ərif′ərəs]
Etymology: L sopor, deep sleep, ferre, to bear
tending to cause deep sleep, such as an agent that induces deep sleep.

soporiferous

(sō″pō-rĭf′ĕr-ŭs) [″ + ferre, to bring]
Promoting sleep.