Do dreams allow you to use that extra % of your brainpower?

The water cooler conversation today was about a movie called Limitless. My colleague briefly gave us an overview of the movie and summed it up as a guy that had the capability to use his brain at 100% capacity, he went on to say that at full capacity the brain can solve the most complicated problems. 
My colleague is a pretty intelligent guy so I started thinking...humm....I solve my biggest problems when i'm asleep via dreams..somehow because its on my mind my dreams connect with the issue...i dream alot! Humm that's a different post lol.
Now, it all really depends on how one interpret and apply what he sees in his dreams.  I still can help but wonder if our brain capacity increases when we are dormant? I've had some pretty intense dreams and many have manifested themselves in the form of Deja vu's....for the next 30 days I'm going to keep a dream journal (at least the ones I can recall).  I will record my thoughts right before bed and try to make some sense of this...
Hey what can I say I'm quirky lol