Beauty-sleep

A medical man, who may be called up at any moment, must make sure of his ‘beauty-sleep.’

Source: wiktionary

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; […]

Source: wiktionary

At first he was quite peevish. "What's the idea," he said, "coming and spoiling a man's beauty-sleep? Get out."

Source: wiktionary