See, I had this nightmare last night. And it was a real doozy because it was a Sleep Paralysis nightmare. Those aren't the normal ones where you get chased by a monster or something. Oh no. If only it were that easy you could just wake up.
See, in a sleep-paralysis nightmare you're already half-awake. You can sort of see the real world, but you have no idea what's going on, like in a dream...only this nightmare has something most don't.
Because there's someone, or some thing, in the room, in the real-world room, with you.
It's usually a dark shape, vaguely humanoid. There but not there.
What it really is, is a mental manifestation of a temporary breakdown in the part of your brain that registers the presence of other people. Kind of like seeing the burned-out area on an old film reel. So it's a hallucination. Only, you're only half-awake so you can't even begin to grasp that fact, and in the meantime you're stuck in sleep paralysis so you can't move…