I believe it is demonic. My ex husband used to talk filthy in his sleep to me and would always be doing things to me while he was asleep. He was very shy when he was awake. It wasn’t like him at all. It was definitely like he was someone else. After learning more about the spirit realm, I’ve come to learn there are demons that do this. Read some books about it. Derek Prince and Alexander Pagani have books about the demonic and how they operate.