The cumulative effect of not getting enough sleep, especially as seen as able to be made up for by sleeping more than usual.

(idiomatic) Alternative form of asleep at the switch

(Britain and Caribbean English, idiomatic) A speed bump.

(games) A children's game in which some participants lie on the floor and attempt to stay motionless, while others try to make them move without physically touching them.

(pathology) A medical disorder of the sleep patterns of a person or animal.

a blindfold made to ease sleeping by covering the eyes to block all light.

(idiomatic, uncountable) Sleep before midnight, on the belief that early sleep hours conduce to health and beauty. / (idiomatic, countable, sometimes humorous) Extra sleep or a special nap.

plural of sleeping policeman

Alternative spelling of beauty sleep

The second sleep of the night in a biphasic sleep pattern, after the watch.