Cervantes (Miguel de Cervantes Saavedra) once said...
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.