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And would I please to remember that I had roused him up at night, and the quality always made a point of paying four times over for a man's loss of his beauty-sleep. I replied that his loss of beauty-sleep was rather improving to a man of so high complexion; and that I, being none of that quality, must pay half-quality prices; […]
1901, Ralph Connor, “A Good True Friend”, in The Man from Glengarry: A Tale of the Ottawa, Toronto, Ont.: The Westminster Company, →OCLC, page 428:
But eager as Kate was for her beauty sleep, the light burned late in her room; and long after she had seen Mrs. Murray snugly tucked in for the night, she sat with Ranald's open letter in her hand, reading it till she almost knew it by heart.
"I know I ought to be taking a beauty sleep," she thought, "so I'll be all fresh and fine for the evening, but I must find it [a piece of turquoise], for I promised Phil I'd wear it."
originally, sleep taken before midnight, on the belief that early sleep hours conduce to beauty and health; now, sleep at any time needed by one to stay beautiful; an instance of such sleep
John S[tephen] Farmer, compiler (1890) “Beauty-Sleep, subs.”, in Slang and Its Analogues Past and Present., volume I, Thomas Poulter and Sons], →OCLC, page 159.