A few thoughts

I've been having particularly vivid dreams lately. They always occur in the early morning, just before I wake up.
I dreamed I was at a party drinking, and then I had to stop because I realized I was pregnant. I didn't know whose it was or why I had only realized it just then.
I dreamed I went to a doctor appointment with my mom, and they told me I had HIV. Again, I hadn't slept with anyone or done anything to get it.
I dreamed I was driving around the South with Robert Randolph (a pedal steel guitarist, opening for Eric Clapton on his tour this summer) and we ran into this old guy with a dinosaur in his barn. As Robert and I were demonstrating proper guitar technique for the man, his dinosaur broke out of the barn and started rampaging around the farm.
That was one of my weirder dreams.
The theory these days is that dreams are the result of random electrical impulses generated in our hindbrains while we sleep. The impuses travel up to the other, more developed parts of the brain, like the visual cortex (producing images) the limbic system (producing emotions) and the prefrontal cortex (interpreting these images and emotions.) They say this discounts the once widely accepted theory that dreams show the fulfillment of the desires we have in our unconscious. But why can't it be both? The cortexes put the randomly generated impulses into a context that makes sense to them, and maybe this process is shaped by our needs and wants. The same set of impulses could produce a dinosaur in one person's dream and Jessica Simpson in someone else's. It's weird to think about. I mean, it happens in waking life--two people could hear the same sentence and find completely different meanings in it.
But what the hell did my brain do to produce Robert Randolph?