A few times I have suddenly been awakened by a noise I can't identify. I have experienced hearing what sounds like a gun shot in my head before when I am almost asleep, but I understand that does happen to others. This noise is like a scream & at first I think it's me but it couldn't have been me because I was almost face down in my pillow with mouth closed asleep. It is so real I'm sitting in bed listening for it to happen again. Does anyone else ever experience this? Thanks.