Something that is soporific is sleep-inducing. Certain medicines, but also extreme coziness, can have a soporific effect.

In the 1680’s, soporific, which doubles as both adjective and noun, was formed from the French soporifique. That word, in turn, came from the Latin sopor “deep sleep.” Beloved Peter Rabbit author Beatrix Potter once noted that, “It is said that the effect of eating too much lettuce is 'soporific'."

Definitions of soporific
  1. adjective
    sleep inducing
    synonyms: hypnagogic, hypnogogic, somniferous, somnific, soporiferous
    capable of depressing physiological or psychological activity or response by a chemical agent
  2. adjective
    inducing mental lethargy
    synonyms: narcotic, soporiferous
    arousing no interest or attention or curiosity or excitement
  3. noun
    a drug that induces sleep
    synonyms: hypnotic
    see moresee less
    a soporific drug that produces an uncontrollable desire to sleep
    sleeping capsule, sleeping draught, sleeping pill, sleeping tablet
    a soporific drug in the form of a pill (or tablet or capsule)
    type of:
    a substance that is used as a medicine or narcotic
    an agent that induces drowsiness or sleep
Word Family