My elderly father repeats "ow" continuously. Sometimes very loudly. Sometimes it sounds like a question. He even does it in his sleep. When we ask him why he's saying "ow" he responds with "I don't know" or "I didn't know I was". I have asked him multiple times if he was in pain or if he needs anything and his response will be "no". I don't understand why he is doing this or how to make it stop. It makes sleeping at night rather difficult for the household. Has anybody else experienced this or have any answers?