[Dave is trying to stay as calm as possible. He can feel his heart hammering in his throat and he just feels completely sick. He didn't want to talk about this before. He wasn't going to want to talk about it now.]

Pretty sure it was a nightmare. What makes you think it wasn't? It's just one of those nightmares like you went to school in just your underwear and you wake up thinking your life is over, only to find that it was just the worst dream you could ever had and it was just your mind doing stupid shit to freak you out.