Sopor :: Sopor (n.) Profound sleep from which a person can be roused only with difficulty.
Soporate :: Soporate (v. t.) To lay or put to sleep; to stupefy.
Soporific :: Soporific (a.) Causing sleep; tending to cause sleep; soporiferous; as, the soporific virtues of opium..
Soporific :: Soporific (n.) A medicine, drug, plant, or other agent that has the quality of inducing sleep; a narcotic..