| Berachot
The Talmud spends quite a number of pages discussing dreams. Taking their cue from the Bible itself, they put great stock in the significance of our dreams. They understood that our thoughts during the day have great impact upon our dreams, and knew that every dream has some elements of untruth to it. The Gemarah goes to great lengths to demonstrate the power, not so much of the dream itself, but how it is interpreted: "All goes according to the interpretation".
We all have many dreams; yet what becomes of the dreams depends primarily on how we want to interpret them. Do we see them as fantasy, to be ignored as we awaken to the real world, or do we act upon them, trying to turn them into reality? No dream can ever be fully fulfilled, but "one who goes seven days without dreaming is a sinner". If you want to accomplish much in this world, then dream big.