Dreams are not just an illusion. They make suffer those even more who believe in truthfulness of their dreams. Dreaming is a clue, a possibility, an idea, a “may be”, a wish leading to become a desire. But sometimes it is not all that. Sometimes it is only, “God, please don’t!” the goodness or badness of dreams depends upon how close it is to one’s desire. 
Desires are life. Desiring something/ anything gives life a theme, a meaning, a way to act, an objective to achieve and ultimately the key of one’s’ happiness. Every being on the face of earth is set to desire something big, good, bold and meaningful regardless of people thinking their desires little, insignificant, coward and useless. The only thing that matters is how fast you hold them. (Just thinking of a reoccurring dream)