Night Voice

I went to the toilet in the middle of the night. After I had just shut the door of the toilet, I heard the most hideous and terrifying voice. It was my flatmate in his room, sleep-talking, or sleep-shrieking. It sounded like exactly the kind of thing you don't want to hear in an empty house at night. It was only one single ululation, halfway between a sigh of supernatural insanity and agonised terror. After this one sound, there was silence, which was, somehow, worse.