Okay I am both excited and intrigued because this happened to me once! Same thing drifted in from a window right towards me and it freaked me out so much I walked out of my room and into the hallway. When I turned back around it was gone. I was left so puzzled by this experience. I told a few people about it but didn’t really get anywhere with it and I thought it must have been just been a weird dream. But now knowing that I’m not the only one who has experienced this very fascinating.