as harry 's little log boat floated on and on he grew tired and from time to time felt himself on the verge of falling asleep , which in his present position would have meant eternal slumber , for no one falls asleep crossing the lake of illusion without immediately becoming a character in the dreams of the deluded ones , for though the images flickering in the fog were very tenuous and ghost like , the pictures reflected upon the hard smooth surface of the lake were only too crystal clear .