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The dog felt very soporific, or tired, after running around all day.
Adjective.
Tending to induce drowsiness or sleep.
Because of the medicine’s soporific properties, the doctor told me to only take it at bedtime.
The Declaration • May 9, 2019 • https://thedeclarationatcoloniahigh.com/40330/wordoftheday/soporific/
Soporific