I have an 8 year old cat who has scratched on doors for some time. He will do this if the door is open or closed, it doesn't matter. If it is closed, he is usually trying to get in to me (he is very attached). At night though, he will be in the room with us, door open and go scratch on the door. I have to call his name a few times and encourage him to get on the bed with us for him to stop. It is very annoying and just odd. No other cat that I have ever had has done this.
Any ideas what it might mean?