Mind games

Last night's dream was very odd; I don't think I've had one like it before. I couldn't call it anything but a nightmare, but there were no scary entities, hazards, or situations. It was just me in a mirrored-but-otherwise-plain room. It wasn't even isolation that made the nightmare. Rather, I seemed to be playing mind games with myself, imagining or pretending something was out of joint, seizing upon it, and squeezing every last drop of fear out of it. Almost as if I was willing myself to become frightened.