Beauty Sleep Definition

noun
A period of regular restful sleep, especially when attained by going to bed early.
American Heritage
Any extra sleep regarded as necessary to sustain a healthy, attractive appearance.
Webster's New World
The definition of beauty sleep is an expression used to explain that a person will be more rested, potentially more beautiful, if they go to bed early or get extra sleep.
An example of a beauty sleep is when a mom goes to bed early so she can look more rested in the morning.
YourDictionary
Beauty sleep is defined as sleep before midnight, or any extra resting time.
An example of beauty sleep is falling asleep at 9 p.m.
YourDictionary

(idiomatic) Sleep before midnight, on the belief that early sleep hours conduce to health and beauty.

Wiktionary
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Other Word Forms of Beauty Sleep

Noun

Singular:
beauty sleep
Plural:
beauty sleeps

Origin of Beauty Sleep

  • From the belief that such sleep helps preserve an attractive and youthful appearance

    From American Heritage Dictionary of the English Language, 5th Edition

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beauty sleep