Ghosts and demons are quite different entities. While ghosts are considered to be malicious at times, often they mean no harm.
From the Dead Sea Scrolls found by accident after WWII:
We often get into a situation when we’d most like to be at two or more places at the same time. But this must be nonsense! Is it?
"Darkness, but a visible darkness—like being submerged in mud yet also being able to see through it. Or maybe dirty Jell-O describes it better. Transparent, but in a bleary, blurry, claustrophobic, suffocating kind of way."
Our soul mainly stores information in pictures. During hypnotherapy some of these pictures are replaced with other ones.