While brain activity during sleep is still largely a mystery, scientists have discovered that dreaming not only consolidates our memories and helps us learn, it may also soothe stressful reactions to bad experiences.
This relatively brief video drops a whole lot of knowledge on why we dream, and what’s going on in our brains when we do so. If you’re in college and cramming for a test on oneirology, you may just want to check out this fast lecture.