The Collaborative International Dictionary
Somniferous \Som*nif"er*ous\, a. [L. somnifer; somnus sleep +
ferre to bring.]
Causing or inducing sleep; soporific; dormitive; as, a
somniferous potion.
--Walton.
Douglas Harper's Etymology Dictionary
Wiktionary
a. causing or inducing sleep, normally with harmful overtones.
WordNet
adj. sleep inducing [syn: soporific, soporiferous, somnific, hypnogogic, hypnagogic]
Usage examples of "somniferous".
As for the somniferous members of the crew, they were carried one by one into the fishing boats and taken ashore.
Niketas had Theophilactus prepare an infusion of somniferous herbs and made Baudolino drink it.
Baudelaires tossed and turned, and wondered about all these things, and as it grew later and later they felt less and less like logs and more and more like children in a sinister and mysterious plot, spending one of the least somniferous nights of their young lives.
Johnny tapped impatiently on the driver's window and said, “A satuvoliclly somniferous ergophobia is unnecessary.