The exact purpose of dreaming is still the subject of debate. However, evolutionary theory suggests that dreaming is a way for the brain to process and consolidate memories, which helps to enhance learning and prepare us for future challenges. Additionally, research suggests that dreams can help us make sense of our emotions and work through unresolved issues, as well as provide insight into our unconscious desires and motivations.
I think that dreams are an important way for your brain to process the thoughts, ideas, memories, and feelings you’ve had throughout the day. They also give your brain a time to relax, and just have some fun with itself.
That’s my best guess, at least!