I repeated dream of losting my penis

It was 16 june 2010. The day was normal but in the night I had the bad dream of having sex with a robot, she just gave me a furiously fast handjob much fast that my penis was badly scratched. And after that she took my penis into her and her pussy just eat the whole of it. It was totally disgusting but I felt no pain in the dream. Next morning I watched that my penis was totally well. The point to be noted was that I had this dream for a week and my mom said that my penis stood erect during the dream . Is It Normal !!!