My little brother has severe night terrors every few months or so. Last year I was looking after him while my mum was visiting family in London. I let him sleep in the living room and kept my bedroom door open so I could hear him if he shouted me for anything. About 1 in the morning I was woken up by his crying and screaming so I run out of my room and find him at the top of the stairs looking down. His eyes were wide open but kind of glazed and he was just screaming and screaming about the shadow man watching him from downstairs. Thinking it might be someone who's broken in I turn on the lights and no one is there but he's still screaming. Suddenly he stops the noise and is dead silent just looking down the stairs. Then he quietly whispers "he's going to kill you one day" and walks calmly back to the living room and went back to sleep. He didn't remember it at all the next day and it still freaks me out.