Lucid dream
dream where one is aware that they are dreaming / From Wikipedia, the free encyclopedia
A lucid dream is essentially a dream in which the person is aware that he or she is in the dream. In a lucid dream, the person does not have to be in control of his or her surroundings for the dream to be lucid, and only being aware of the dream itself is sufficient condition for the dream to be described as lucid.
The art of lucid dreaming is the art of being able to control your surroundings in the dream itself. People who lucid dream can usually control everything that happens in their dream. They can teleport, fly, make something appear, or even make everything disappear. Regular lucid dreamers usually do so for spiritual reasons but there certainly are people who do it for fun or to avoid bad dreams.