A long time ago, before the mechanism or an OBE separation and bilocation and/or other phenomena were properly understood and catalogued, some mystics believed that certain transition phenomena were attacks. For example, Dion Fortune, a doctor from the last century (or last two centuries, at the end) believed that the hag/paralysis phenomenon was physical, (as in a brain-induced) except for when you feel the weight on you- that she interpreted as an attack. Nowadays, we know about sense memories and neurotransmitters, so a lot of opinions have changed on the matter, and a lot of symptoms can now be attributed to energy body feedback and physical phenomena.
But because the fact is that a good part of these experiences have a nonlocal aspect (even though paralysis is brain caused, vibrations may be a perceptual phenomenon that may be explainable various ways, etc,) there is always interpretation- some may see more of it as externally caused, some may see more things as internally caused.
I for one don't see any of that as externally caused either.