de la duración.
Now dreams seem long: we only discover afterwards and by accident their almost incredible brevity.
May we not—must we not—infer from this that the body is an organ of many stops and more than one keyboard, and that in sleep it gives forth this richer music.
The theory of a higher-dimensional existence during sleep accounts in part for the great longing for sleep.
"What is it that is much desired by man, but which they know not while possessing?" again asks Leonardo. "It is sleep," is his answer.
This longing for sleep is more than a physical longing, and the refreshment it brings is less of the flesh than of the spirit. It is possible to withstand the deprivation of food and water longer and better than the deprivation of sleep. Its recuperative power is correspondingly greater.