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Merriam-Webster's Word of the Day for November 7, 2021 is:

soporific • \sah-puh-RIFF-ik\  • adjective

Soporific means "causing sleep."

// Studies show that the herb has a soporific effect.

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Examples:

"Relying on repetition and rhyme, the text generates a gentle, soporific cadence as the little lions progress homeward…. The painterly, realistic illustrations create the feel of approaching night…." — Kirkus Reviews, 1 Oct. 2021

Did you know?

Soporific comes from Latin sopor, which means "deep sleep." That root is related to somnus, the Latin word for "sleep." Despite its meaning, somnus has been active, giving English somnolence (sleepiness), somnambulism (sleepwalking), and many other "sleepy" words.