Ive frequented this site for sometime now, and have not yet come across anything like the link I have provided. This is the best explaination I have read about reasons as to why the body experiences Astral Projection, Sleep Paralysis, and how the brain functions when this occurs.
I may be wrong in what I've found but IMO it is the best possible reasoning. (FINALLY!)
http://www.crystalinks.com/thirdeyepineal.html
edit for spelling error(I miss that one too...english often makes no sense...)