Let us now consider how the dreams that we dream every night are formed. Our mind is made of vibrations, or let us call them atoms. These have the property of receiving impressions; they are just like a photographic plate. They are continually receiving impressions: impressions of heat or cold, of friends or enemies. These are stocked in the storehouse of the mind - so many thousands, so many millions of impressions, more than can be counted. When you are asleep, when your body is resting but your mind is active, these pictures appear before you, just like a moving picture on a screen. Then, when your mind is fully exhausted, deep sleep comes.