Before I met my late wife, I had a dream about something that happened to her before I met her... I think I probably dreamt about it *while* it was happening, but we didn't actually meet until more than ten years later, and it wasn't until years after that that she mentioned the incident and some time even after that before I recalled the dream... Could be, I'm just nuts.
Actually, slightly off-topic, but it was a dream that made me propose to my wife too. I dreamt she fell off the back of my motorcycle and died, and it was at that moment when I woke from my dream in a cold sweat that I actually realized how much she meant to me. I told her that too, later, but she pretty much thought I was nuts.
It was the reason I got rid of my bike, though. Strangely enough it wasn't long after she passed away that I decided to go buy another bike...