underscore, dream is dream! And reality is reality! Dream cannot be reality and reality is not real if it is like a dream. Suppose you are walking down the street at utter darkness and you realize that there is a snake ahead, but upon getting closer you found out that it is not snake but a rope. Rope is the reality. The superimposition that your mind has put on that rope as snake is unreal based on your limited awareness of that real substratum which is rope in this case.