Hi Jose, I can appreciate what you are experiencing, because this has happened to me also. But before I actually go on with telling you my experience, I would urge you start a different post for your questions to be answered appropriately.
Let me give you a little background first before I go on. I do not practice the occult, I don’t watch tv because I cant afford paying for cable at the moment. I don’t visit occult websites or anything for that matter. I consider myself to be a healthy person, both physically and mentally. As a matter of fact, I attend Mass almost daily, and I am an Altar Server, and I am very active in my parish. I pray the rosary daily, try to do the Divine Office daily as well. So spiritually, I don’t for see any problems as well.
But I have been victim to the bed shaking. As a matter of fact, it happened 3 times last night. It had happened the first time in April, but this was after I had a really bad dream. I dreamt that I was looking for my brother in an office building. There was a man standing outside of a door and I asked him where my brother was at. He told me that he had went in the room where he was standing outside of. He told me to go in, and when the door opened, I saw nothing but darkness. Then I felt scared of going inside, I felt a demonic presense there. I woke up, a few seconds later I still felt that presence and my bed started to shake. I started to pray the rosary, and still felt that presence there during the first decade. After I had finished praying the rosary, everything was peaceful.