A vision is more clear in the sleeping state than in the wakeful state. The reason is that when a person is asleep he lives in a world of his own, but when a person is awake he is only partly in that world and mostly in the outer world. Every phenomenon needs accommodation. It is not only the sound which is audible, but also the ears make it possible to hear the sound. The mind is the accommodation to receive the impressions, just as the ears are the accommodation to receive the sound. That is why a natural state of sleep is like a profound concentration, like a deep meditation; and that is why everything that comes as a dream has a significance.