http://www.bibliotecapleyades.net/ciencia/ciencia_psycho_luciddream06.htm

"Out of body” experiences (OBEs) are personal experiences during which people feel as if they are perceiving the physical world from a location outside of their physical bodies. At least 5 and perhaps as many as 35 of every 100 people have had an OBE at least once in their lives (Blackmore, 1982). OBEs are highly arousing; they can be either deeply disturbing or profoundly moving. Understanding the nature of this widespread and potent experience would no doubt help us better understand the experience of being alive and human.