Quote Originally Posted by cmind View Post
Sorry bub, but if you have a choice, it's not paralysis by definition. That's called "choosing not to move".
Not really no, if it was choosing not to move it would imply that I could move whenever I want to.

According to wikipedia :
Physiologically, sleep paralysis is closely related to REM atonia, the paralysis that occurs as a natural part of REM (rapid eye movement) sleep. Sleep paralysis occurs either when falling asleep, or when awakening. When it occurs upon falling asleep, the person remains aware while the body shuts down for REM sleep, and it is called hypnagogic or predormital sleep paralysis. When it occurs upon awakening, the person becomes aware before the REM cycle is complete, and it is called hypnopompic or postdormital.[10] The paralysis can last from several seconds to several minutes
And can also be found in this medical study :
http://tinyurl.com/cf9d7fu

By any chance, does anybody has access to the full text?