After many many decades of people debating this, you might have figured out the reason why we dream. Yes. And it's a simple answer. So if you go blind, the visual cortex in the back of the brain gets taken over by hearing and by touch and by other things. In fact, our colleagues at Harvard did an experiment where they blindfolded normally cighted people. And you could start seeing that takeover happening after 60 minutes. And that's when we realized, wow, the purpose of dreaming is to defend the visual terr ...