soporific

adjective

Inducing or tending to induce sleep.

adjective

Drowsy.

noun

A drug or other substance that induces sleep; a hypnotic.

Tending to produce sleep.

noun

Anything which causes sleep, as certain medicines.

adjective

Causing sleep; tending to cause sleep; soporiferous.

noun

A medicine, drug, plant, or other agent that has the quality of inducing sleep; a narcotic.

noun

Something inducing sleep, especially a drug.

noun

Something boring or dull.

adjective

Tending to induce sleep.