Does anyone get this when they lie down? It's only when I lie down and it depends on what position but I've read it can be really serious and that scares me. I think I've always had it I've just never noticed it and it's never been important enough to worry but now am scared about brain tumors etc and I'm constantly listening to see if I can hear it. It's normally only when I'm in my bed and don't hear it if I'm lying on the sofa or anything. Only in one ear as well