night owl

noun3

1. •
   An owl (order Strigiformes) that is nocturnal.

   • Their Weapons like to Lightning, came and went: / Our Souldiers like the Night-Owles lazie flight, / Or like a lazie Thresher with a Flaile, / Fell gently downe, as if they strucke their Friends. — 1591
2. •
   One who goes to bed late, or stays up late at night or in the early hours of the morning.

   • "You are one night owl, Monsieur Reetchie," he said. / "And you seem to prefer the small hours for your visits, Monsieur de St. Gré," I could not refrain from replying. — 1904
3. •
   A musical instrument which imitates an owl's hoot, consisting of a receptacle partly filled with water and a mouthpiece that is blown into.

   • The night-owl,—a mug-shaped instrument, with an orifice in its side, through which a whistle is inserted,—when used, is partly filled with water, to give the tremulous owl-hoot sound. — 1874