somniferous

Adjective

Synonyms: soporific soporiferous somnific hypnogogic hypnagogic

WordNet 3.0

Adjective (1)

sleep inducingSynonyms: soporific soporiferous somnific hypnogogic hypnagogic

Webster's Dictionary (GCIDE)

Somniferous \Som*nif"er*ous\, a. [L. somnifer; somnus sleep + ferre to bring.] Causing or inducing sleep; soporific; dormitive; as, a somniferous potion. --Walton. [1913 Webster]