Reading the description of a friend's dream taking place in and around crawlspaces reminded me that I have ALWAYS had these dreams. Usually am hiding, chasing, or being chased through the 'secret passages' through the walls and crawlspaces of a house. Think wooden playground structures with kid-sized tunnels and you get the idea. Impossible little turns and the like, always unfinished wood, and usually dark and dirty.
I had one of these the other night as well, but it was different. I cannot recall much detail, but there is always the aspect of danger, mostly the claustrophobic 'trapped and cannot turn around' effect. It was coupled with another recurring theme, one of scaling waterfalls and gorges, and rock tunnels.
Just thought it was weird to read the description of another person having such a similar dream.