soporific

unettava, uni-

uninen

unilääke Something induce inducing sleep, especially a drug.

The doctor prescribed a soporific to help the patient sleep.

The professor delivered a soporific lecture.

For we are not here to understand, as perhaps some have, that an author actually falls asleep while he is writing. It is true, that readers are too apt to be so overtaken; (..)To say the truth, these soporific parts are so many scenes of serious artfully interwoven, in order to contrast and set off the rest;

It is said that the effect of eating too much lettuce is “soporific.” I have never felt sleepy after eating lettuces; but then I am not a rabbit. They certainly had a very soporific effect upon the Flopsy Bunnies!