Shadow People

I had similiar experiences growing up:  repetitive visits from a tall shadowy shape.  I was 5 - 7 and it would stand in my doorway.  I would always awake.
These visits preceeded my first body paralysis experiences and I recall a few attempts to lift or drag me out of bed, though I usually woke up around then.

Later in life, living overseas, I would catch glimpses of a shadow being.. much smaller.. like a corner lurker or something.  The nights I saw it, my co-workers who lived in the apartments above me complained of nightmares etc. 

Also had an experience of floating out of my bed in an OBE to wind up wrestling with a being my size (perhaps my own shadow) and being unable to get anywhere with it until I stopped trying to 'wrestle' in the astral realm and just bombarded it with light... it quickly shriveled into nothingness and I awoke in my bed.

That's all I recall of the top of my head.

Obviously they are demons because this one picked me up and was sucking my energy! Plus it comes at midnight with its pitch black self.

I have seen a video that when you label or do something to the water, you change the structure of the water crystal.
When you bless the water, its crystals are changed to something else.

Relating to how water affects demons and ghosts... If you cross running water, it will keep the demons away.
Probably the positive blessed water has crystals with these special properties that demons do not like! That sentence was just a thought how I put pieces together right now, I'm not really sure.

By thought. The mind is able to change the water crystals.