What he's describing is common, it's called 'sleep paralysis'. You're in what's called a hypnogogic state when it happens, trust me, it's nothing and well researched. I've had it once a friend of mine had it, complete with various beings in his bedroom and not being able to move, for about two months. He changed jobs, cut down on his stress levels by 80% and they stopped. Seriously do not buy any of the demonic crapola. You're fine.

MelT