Whether it's a medication or a boring lecture, something somniferous makes you sleepy.

Like soporific, somniferous is a word used to describe something that puts you to sleep. Some people who have trouble snoozing take pills that are somniferous: sleeping pills. Others do somniferous things, like reading before bed or counting sheep. A bad public speaker can be really somniferous, and so can a boring movie. Anything somniferous makes you want to catch some Z's.

Definitions of somniferous
  1. adjective
    sleep inducing
    synonyms: hypnagogic, hypnogogic, somnific, soporiferous, soporific
    capable of depressing physiological or psychological activity or response by a chemical agent
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