If it is true that the sea was once upon a time our native element, into which we must plunge our cooling blood if we are to recover our strength, it is the same with the oblivion, the mental nonexistence of sleep; we seem then to absent ourselves for a few hours from Time, but the forces which we have gathered in that interval without expending them, measure it by their quantity as accurately as the pendulum of the clock or the crumbling pyramid of the sandglass. Nor does one emerge more easily from such sleep than from a prolonged spell of wakefulness, so strongly does everything tend to persist; and if it is true that certain narcotics make us sleep, to have slept for any time is an even stronger narcotic, after which we have great difficulty in making ourselves wake up. Like a sailor who sees plainly the harbour in which he can moor his vessel, still tossed by the waves, I had a quite definite idea of looking at the time and of getting up, but my body was at every moment cast back upon the tide of sleep; the landing was difficult, and before I attained a position in which I could reach my watch and confront with its time that indicated by the wealth of accumulated material which my stiffened limbs had at their disposal, I fell back two or three times more upon my pillow.