Do you have a dream, or do you have a vision? Two similar nouns, but very different realities. Think about it - dreams occur when you are sleeping. Most times you are not in control of your dreams and may not even remember what you saw once you wake up. On the other hand, visions occur when you are awake. Your eyes are fully opened. And you definitely remember what happened. The definition of a dream is a series of thoughts, images, and sensations occurring in a person's mind