soporiferous
adjective[L. soporifer; sopor, asleep, and fero, to bring; from sopio, to lull to sleep.]
Causing sleep, or tending to produce it; narcotic; opiate; anodyne; somniferous. The poppy pssesses soporiferous qualities.
[L. soporifer; sopor, asleep, and fero, to bring; from sopio, to lull to sleep.]