What do you dream about?

I dream about floors falling in. Often I am standing on a high up floor, and then the floor caves in, or I notice the floor doesn't cover the whole room, and I can see down into the floors below. Last time I dreamt that the corners of the floors had been pulled back, like from the top of yoghurt pots, and you could see all the way down through the gaps. Apparently dreaming of high floors means you have high aspirations, but buildings collapsing means you feel unsure about things.