As we all know, dreams are a mysterious thing. Nobody knows why it exists or what it's used for.

Many people have done research and have theories for dreaming, and yet nobody has found a real reason for dreaming. Five of the most supported are briefly explained here: http://health.howstuffworks.com/ment...eam.htm#page=0. The question here is: Which theory do you support and why? Remember that whatever theory you choose does not have to be from the link provided.

Personally, I believe that dreaming has to do with your brain functions like fear, happiness and other emotions and also things like your imagination, logic and a personality check. But, I'm too lazy to go hunt for evidence.