I denied/ignored this until now, but I know it happened several times. What happens sometimes is that I hear unintelligible voices briefly while I am asleep or half asleep. I know there is no voices because I will be awake after I hear the voices for a minute or two waiting for the voices to happen again, but nothing happens, and all there is, is a complete silence, because it happens after midnight while people are asleep and there is no noise. I am afraid I'm losing my mind. Am I?