My most noted "abnormal" dream was one that took place only over an 8hr sleep cycle, but the time in the dream was exaggerated to several months. I was placed in a hospital room, told that I had a terminal disease, and was essentially waiting to die.

I was left completely alone in this room for several months; not one person visited me or contacted me. I eventually ended up (in the dream) expiring, and upon doing so I awoke into the "living world" where I was informed that it was reality.

I managed to turn sleep into an enemy after that night, which probably led to the next manic episode where I did not sleep for several days afterward.