Well, specific to waking up and feelign the menacing presence, this used to happen to me, I discovered it was called "sleep paralysis". I couldn't move my body, and I could feel these energy waves in my head. It's what happens when your mind wakes up but your body is still sleeping. It's scary, and many people who experience it feel there is something ominious about it. I think I believed I had been abducted. I learned about it in Carl Sagan's "The Demon Haunted World".
And Christianity thinks everything is from the devil, be it pyschic abilities or looking at someone you find attractive and imagining what it would be like to "party" with them, there is not one thing that is different or makes you feel good in the world of Christianity that is NOT of the devil.
Makes for quite a guilty, heavy life.
