(rail transport) A railroad car with sleeping facilities for passengers travelling overnight.

(computing) the state of a computer system in which the drives and interfaces are switched off, and the only task running is monitoring external activity, particularly a key press which restores the system to its active state from the random access memory.

(pathology) Brief interruptions of breathing during sleep.

(transitive) To cause (someone) to sleep. / (transitive) To help (someone) to bed; put to bed. / (transitive, figuratively) To render dormant.

To fall asleep / (idiomatic, figuratively) To be affected by paresthesia; to go numb. / (euphemistic) To die

A pattern of sleeping and waking; especially a regular pattern of sleeping and waking designed to promote health

The condition of being kept awake and not getting enough sleep (perhaps forcibly by someone else, or by a sleep disorder), to the point of noticeably lower alertness.

plural of sleeping pill

(pharmacology) A pill or tablet having a soporific effect.

(idiomatic, euphemistic, almost always preceded by the) Death.