"The proper way to economize life," says Tesla, the electrician, "is to sleep every moment that it is not necessary or desirable that you should be awake."
"A man in his lifetime has just so many hours to be awake, and the fewer of these he uses up each day, the more days they will last — that is, the longer he will live.
"I believe that a man might live 150 years if he would sleep most of that time. That is why negroes often live to advanced old age, because they sleep so much. It is said that Gladstone sleeps seventeen hours every day; that is why his faculties are still unimpaired, in spite of his great age."
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