Francis Crick, (of Watson and Crick DNA fame), got very interested in brain science toward the end of his life and gave several worldwide lectures on that subje

Francis Crick, (of Watson and Crick DNA fame), got very interested in brain science toward the end of his life and gave several worldwide lectures on that subject. I was fortunate to attend one of them. During which he proposed several interesting theories. My favorite being that the purpose of dreaming was to identify and collect all the well-separated bits of something designated to be forgot, (tracing the chain of fragmented memory blocks); exactly as you suggest: the biological equivalent of garbage-collection.