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

(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.

Alternative spelling of beauty sleep

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

A particularly sound sleep / The first sleep of the night in a biphasic sleep pattern, before the watch.

Third-person singular simple present indicative form of go to sleep

past participle of go to sleep

present participle of go to sleep