Wow, that's a textbook nightmare. Feelings of being uprepared, singled out, in the wrong place, simple activities becoming super complicated, inescapable failure, the whole bit. Just keep in mind, you get to do the LSAT when you're awake, in reality, where causes have predictable effects.
Still, freaky just to read about it. All my LSAT dreams have been pretty prosaic; studying endlessly, not getting any questions right, etc.