Somniferous \Som*nif"er*ous\, a. [L. somnifer; somnus sleep + ferre to bring.] Causing or inducing sleep; soporific; dormitive; as, a somniferous potion. --Walton. web1913

somniferous adj : sleep inducing [syn: {soporific}, {soporiferous}, {somnific}, {hypnogogic}, {hypnagogic}] wn