Feeling sleepy or tired and having trouble staying alert; in a state between wakefulness and sleep.
From Middle English 'drousy' or 'drowsy,' possibly from Old Norse 'drúgr' (sluggish). The exact origin is uncertain, but it emerged in English by the 1400s with its current sleep-related meaning.
There's actually a medical condition called 'hypersomnolence' where people are perpetually drowsy—it's different from laziness and can be caused by brain chemistry, showing that 'drowsy' describes a real physical state.
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