This dream reminds me of the Predestination Paradox, in which someone goes into the past and messes with it, either on purpose or by accident, but the future doesn't change, meaning that what happened was meant to happen (like someone going back in time to stop the great Chicago fire, and knocking over a lamp and starting it themselves.) Wierd dream. This'd make a good short story...

Hah, I remember having another dream where my pupil grew very large, so that it filled the entire eye, and then it shrunk, until you could barely see it.

My mom thought that would be something cool for a movie where someone gets possessed.