Dream Image 300 Out of body experiences are unexplainable. The following link is given with the warning that it is unknown if these techniques are safe. My including this link should not be taken as advice or as a recommendation. It is being presented only as a point of interest. It is safer and preferable to focus on in body experiences.
Also , here is a manual written in 1894 describing Astral travel via out of body experiences:
Fly on down to my book at http://www.drstevenfox.com