Perhaps one of the most vivid dreams (potentially more of a nightmare) I've ever had happened the night before my Revs exam in 2015.
I dreamt that in the exam, we had to draw the life story of Jung Chang, a historian who is noted for being very critical of Mao. So there I was, opening the exam, expecting to be doing two 3 or 4 pointers and a doc study for China, and a doc study and essay for Russia. The Russian section of the exam basically ceased to exist, and it was something like a 60 page exam, full of questions and boxes for drawing Jung Chang's life story, and then as I was flicking further along the exam with about 5 minutes to go, I finally got to some of the styles of questions I was expecting. But it was just impossible to achieve anything in the exam, because there was too much to do with only a few minutes left.
Horrible. But also kinda funny
I kinda figure it's like the dreams you get before say, an important sporting game. The night before every single grand final I've played in, I've always dreamt that when I tried to run, my legs got all tangled and I couldn't go any faster than walking pace