I think it's more likely that when you woke up from your dream, a part of your subconcious mind was still giving you visions which melded with your actual sight. That happens to me alot, I used to be freaked out to, before I read up that if you wake up very abruptly sometimes that can happen. It may seem like the paranormal but it's just your mind. It seems even more likely because you saw a familiar form of a "ghost being" instead of something more original which you have not seen before.