you turn off the light and lay down, then you see it. It's there, it'd always there. The big tall figure that looks like it's about to hit its head on the ceiling, standing there, can't tell what it looks like clearly but from what you can see it's tall, having long black hair and long nails? Fingers? It's too dark

it might kill you, might just be there to watch over you, you don't know. But it get sense your fear.