I have a fear of open doors. I feel uncomfortable if they are open and hasten to close it. The feeling intensifies by night. My sister on the other hand is afraid of closed doors ONLY when she is in bed. The symptoms are mild, and i dont reallyy experience that much except for the need to close it, or in my sister's case to open it. What is wrong? I am not afraid of open spaces, taking chances or anything else. So what is it?