I read this book True Haunting. It's a great account.https://www.amazon.com/dp/B005G516G6/ref=rdr_kindle_ext_tmb
I had a presence in my house last year. I don't know what it was. A spirit or a ghost, it was a non physical entity.
In fact last year was a strange time. I had night terrors, strange dreams and disturbances by non physical beings for a couple of months.
One thing I do know is that they feed off of fear. I got to a point where I decided I was tired of being afraid and decided to confront them and own my space (my apartment). I cleared out my space energetically after that they stopped coming.