noun
a state of drowsiness or sleepiness; the quality or condition of being sleepy or drowsy
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The patient experienced somnolence as a side effect of the medication.
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I feel so somnolent after that big meal.
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I can't keep my eyes open, I'm so somnolent.
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The somnolence of the small town was a stark contrast to the hustle and bustle of the city.