How the brain processes memories during sleep
In chapter 3 we raise the common question about the purpose of dreams in sleep. But there is an even wider oft-considered question about the purpose of sleep itself. New research reinforces that the brain processes new memories into long-term storage, but also helps us to forget similar memories. Here's the story https://bigthink.com/neuropsych/memory-consolidation-sleep-targeted-reactivation/, and here's the research: http://learnmem.cshlp.org/content/29/11/401.full.