Yet Diana, with its soporific romance and awful dialogue, is a colossal bore.
He sounds like a soporific senator defending the ugly compromises of Washington.
The premise is this: turkey is chock-full of a soporific essential amino acid, tryptophan, one of the 22 essential amino acids.
"tending to produce sleep," 1680s, from French soporifique (17c.), formed in French from Latin sopor (genitive soporis) "deep sleep" (see sopor). As a noun from 1722. Earlier as an adjective was soporiferous (1580s as "characterized by excessive sleep," c.1600 as "soporific").
soporific sop·o·rif·ic (sŏp'ə-rĭf'ĭk, sō'pə-)
Inducing or tending to induce sleep.