There's psychology and physiology to blame for those sensations. I did read about it somewhere and I could Google it but there's not much need. No need to freak out either. In all the thousands of years people have been making these claims of seeing ghosts, demons etc., There's not one slice of solid evidence... Funny about that. I guess point being, there's very likely no gods, angels or demons. Maybe something behind all this but it seems clearer everyday that it's not the deity of the Bible. Perhaps just some disinterested intelligence. Definitely not interested enough to credit its rational, logical creation with any tangible proof of its existence.