might want to look into the threads here .... search on "sleep paralysis" ... from a couple of montbs ago.  You can reserach/Google it and compare what you read with your own experience.  I've had lots of it, it became almost amusing as I had more of it.  I'm not saying that's what you're experiencing, but it sounds like it from what you've written.  I believe it's connected to mediative states that happen naturally (and possibly induced if what we read about the pineal gland, etc is true) in the body...if so , there is something to learn from it...you can take control of it or at least watch it objectively knowing more about it.