Lucid dream
A lucid dream was a technique allowing one to take control of one's dream. They could do anything that they want as long as they stay in control, even waking up whenever they want.

Tom Paris once had an experience in which after realizing he was dreaming he was able to fly. In 2374, Chakotay used a lucid dream to make contact with a group of Dream Aliens that were taking over the crew of  in their dreams, choosing the image of Earth's Moon to "remind" him that he was dreaming. ()

Appendices

Related topics 
 Directed dreaming
 Communal dream
 Self-hypnosis
 Vision quest

External link 
 

de:Lichter Traum
Psychology
Sleep