My dog has been behaving strange recently. He always sleeps with my mom at night and for some reason he started to sleep in strange places like above her head or started to walk around her head. Also, when this happen and my mom tells him to go away he starts walking arround the house, scratching my bedroom's closed door until I open it and he jumps on my bed and walks arround my head too. I don't know what's happening to him, the vet said he is very healthy but when I look at him when he behave strange I find something different in him, like if there were something wrong with him. I thought maybe he can't sleep well or something like that. He's 8 years old. The vet said it wasn't something I should pay too much attention but I'm not sure. If someone have some idea of what could be happening to him please tell me.