Lewis Short
(adjective) : sŏpōrĭfer, fĕra, fĕrum, sopor-fero
* Sleep-bringing, inducing sleep, sleepy, drowsy (poet. and in post-Aug. prose): papaver,Verg. A. 4, 486: lac,Plin. 19, 8, 38, § 126: potio,Spart. Hadr. 26 fin.: vis pinnae,Plin. 9, 13, 15, § 42: genus (trychni),id. 21, 31, 105, § 180: somnus,Luc. 3, 8; cf.: aula Somni,Ov. M. 11, 586: nox,Sil. 7, 287; Petr. poët. 128, 6, 1: Lethe,Ov. Tr. 4, 1, 47: vices,Claud. Rapt. Pros. 3, 404.
Charlton T. Lewis, Charles Short, A Latin Dictionary