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You wake up in a cold sweat. As you sit up and look around, you discover something horrifying.
You aren't in your bed. You're on a tiny cot, your legs dangling off the end.
You aren't in your bedroom. The room is empty and dark, without windows or any decoration. You're freezing.
You aren't in your house.
In the room, the only thing besides cobwebs and dust bunnies is a tall door.