If you have a dream where you are wearing dark sunglasses, then this means that you are busy thinking about your cool quotient and how awesome you could potentially be. Sunglasses are known for being a very cool item to own and to wear. Of course their primary focus was originally meant as a way to help protect your eyes from the harmful rays of the sun, but now that they have become so popular, you can find them everywhere in highly stylized forms with ridiculous cuts that barely cover the eyes at all. Of course the dream could be a sign that you need to protect your eyes a little bit better, but when it comes right down to it, there is probably a better way that your mind could think of to let you know you need to take care of your eyes.
No, if you have a dream where you are wearing dark sunglasses it is because you want to be cool, either that or you have just done something which made you feel exceptionally cool. You are an awesome person and it is thanks to that that you are able to be so objective about the way you look and act. Sunglasses would probably suit you in real life too if they look good in the dream. Don't be afraid to let the cool side of yourself out every once in a while. This is how you will get a large amount of attention.