((This is based on an experience I had with sleep paralysis, I only called him Mr. Ornament because he was standing by the small Christmas tree in the corner of my room when I was 8.))
It is your first night with no nightlight. You were a little nervous, but you decided to get the first night over with. You turned off the light, a little startled by the sudden darkness that filled your room, but you just closed your eyes and fell asleep.
But then, you woke up, frozen in place. You couldn't move. You could only breathe and look around the room. Your eyes traveled to the corner of the room to see a tall, pitch black figure whose head almost touched the ceiling. But it was behind the three foot tall Christmas tree that you've had for three years, and it never left that spot. The figure just stood there. MENACINGLY.