What is a dream might be reality. What is reality might be a dream. Reality is not real unless we look at it. Think of your room for example, if your were to close your door so you can't see it anymore it doesn't exist anymore, but if someone were to look into your window it would become real again. Reality is not there if nobody is looking at it. So the question "If a tree were to fall in the woods and nobody was around to hear it would it make a sound". The answer is that it would not make a sound. Since there was nobody to hear it it did not make any noise but if we were to put a microphone next to a rotten tree and walked out of earshot at let it fall it would make a noise because we were recourding it so it is like reality can tell that were watching it. So be careful of what you dream about because what is in dreams could be in reality.