Dad has dementia, he normally potters around or sits dozily with his sunglasses on. Yesterday he came in the room and in a loud voice did a german greeting rhyme. It was unnerving and he started to tell stories and speak different languages that he had learnt at the end of the war. We engaged him and had good conversations and even a sing along. I asked mum what has she had or had not given him. No changes there. I guess old memories I have never heard him talk about have come to his mind. I was good to get engaging conversation and life stories. I guess this is a stage where old good memories are top of his mind. Any experiences of this anyone? and advice?