Used other than figuratively or idiomatically: see deep, sleep. / (rare, fiction) Artificially induced hibernation in humans for the purpose of long distance space travel.

(uncountable) The state of reduced consciousness during which a human or animal rests in a daily rhythm. / (countable, informal) An act or instance of sleeping. / (informal, metonymically) A night.

(intransitive) To rest in a state of reduced consciousness. / (intransitive, of a spinning top or yo-yo) To spin on its axis with no other perceptible motion.

That which makes smooth; varnish.

(dated) With ease and dexterity.

Having an even, smooth surface; smooth / Glossy. / Not rough or harsh. / Slim and streamlined; not plump, thick, or stocky. / Of stock animals, healthy, well-fed and well-groomed; in good condition.

To make smooth or glossy; to polish or cause to be attractive.

The stage of sleep during which most brain activity and dreams occur, characterised by rapid eye movement (REM).

(simile) To sleep very well, especially peacefully

Used other than figuratively or idiomatically: see sleep, in. / (intransitive, idiomatic) To sleep late; to go on sleeping past one's customary or planned hour.