Drips
I dreamt that I'd been having some work done on the house, and the builders had just finished. I was at home, in the bedroom, and it was raining outside, when all of a sudden I noticed some drips coming from the ceiling.
I got a step ladder and removed a part of the ceiling to investigate, but by the time I'd done that the rain had stopped and the ceiling was no longer dripping. When I opened up the ceiling I found that the build had left some junk behind including a couple of his tools.
I could hear a sound like running water coming from underneath the floorboards in the middle of the room, so I lifted a couple of floorboards to see what was underneath. When I lifted the floorboards I found a pair of pliers and some other random tools there too.
We couldn't find the leak, and were debating spraying the roof with the hosepipe to see if we could get water to come through, but in the end we decided it probably wouldn't be enough water.