Why do we dream?

Why do we dream?

I've no real idea why we dream at all. I just interpret perceived dreaming as an awareness of oneself during rapid eye movement sleep, which is the dream state. During rapid eye movement sleep the brain is almost as if it's awake. But because most of the centers are pretty much disconnected, there are little bits that are working but not pass the information up. You're free floating in whatever the brain's trying to do at that point. So I think cultures have ended up interpreting dreams in a variety of ways and the interpretations vary on the cultural, the time point in that culture, so I have no real idea of what they mean at any one point in time.