Now, blessings light on him that first invented this same sleep! it covers a man all over, thoughts and all, like a cloak; it is meat for the hungry, drink for the thirsty, heat for the cold, and cold for the hot. It is the current coin that purchases all the pleasures of the world cheap; and the balance that sets the king and the shepherd, the fool and the wise man, even.
There is only one thing, which somebody once put into my head, that I dislike in sleep; it is, that it resembles death; there is very little difference between a man in his first sleep, and a man in his last sleep.
— Miguel de Cervantes, Don Quixote (1605-15), Part II, Chapter LXVIII.