You can read meaning into anything. For the most part though, dreams are just synapses firing randomly. I wouldn't read too much into them, or at least not take the interpretations too seriously.
I imagine it (non-scientifically) as the brain's trash compactor, finishing up all the half-completed thoughts of your day, not necessary in any sort of logical way, like mashing the pieces of a jigsaw puzzle together regardless of how well they fit, to get something that just barely fits together at a glance.