"Sleeper" has a number of different meanings, usually connected to sleep in varying degrees of literalness: Sleeping girl Sleep is the fundamental anabolic process common to all life forms, plant and animal. ...
A Sleeper is an automobile that has any manner of modified engine, drivetrain, suspension, brakes or other parts, with the goal of improving its original performance, while still maintaining the outward appearance of a stock, factory equipped vehicle. The British term for this is a Q-car
A small hoop earring typically worn at night to keep the hole in a pierced ear open.
In the Captain America comics, a nazigiant robot that was installed by the Red Skull in Germany to sleep for twenty years and then destroy the world. Four of them existed, three to be combined, the latter on its own.
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