'When I close my eyes I'm in the library'.
The idea that you can simply decode dreams using lists of correspondences is very silly, I know, but I think there are a few rules of thumb about the meaning of dreams. I generally think a house is the Self, and the rooms parts of the Self. A more rare but loosely recurrent dream image for me is the Library. Sometimes I dream that every night I go to the Library, and everyone on Earth is there. I think this is an image of the collective unconscious (whether it exists or not). It has with it the feeling of massive potential.
I seem to remember I have heard other people mention the Library Dream. I bet Steven Moffat has had it too. But perhaps I'm projecting - anyone else had this dream?