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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Drowsy; inclined to, or overcome by, sleep. She waked her sleepy crew. (Dryden)

2. Tending to induce sleep; soporiferous; somniferous; as, a sleepy drink or potion.

3. Dull; lazy; heavy; sluggish. 'Tis not sleepy business; But must be looked to speedily and strongly. (Shak)

4. Characterised by an absence of watchfulness; as, sleepy security.

(Science: zoology) Sleepy duck, the ruddy duck.

Origin: AS. Slpig. See Sleep.