Last year sometime I had an extremely vivid dream that my room was flooding. It was so real I could feel the chill of the water as it rose up my legs and could hear the waves crashing into my furniture.
I woke up the next morning and everything in my room that had previously been on the ground (trash can, dirty clothes, fan, etc) had been moved to higher ground. Most things were thrown on top of my dresser and shoved anywhere they could fit. How can one rearrange furniture and prepare the room for a great flood and not remember it? amazing.