There are special nightmares for the daytime sleeper: little nervous dreams tossed into some brief restless moments of unconsciousness and breaking through the surface of the mind to become confused at once with the horror of some waking vision. Such are these awakenings, like an awakening in the grave, when one opens one's eyes, stretched out rigid with clenched hands, waiting for some misery to declare itself; but for a long time it lies to suffocation upon the chest and utters no word.