The discussion centers on the meaning of dreams and the scientific understanding of their origins in the brain. One participant suggests that dreams serve as a mechanism for the brain to process and sort information during REM sleep, highlighting the importance of REM sleep for memory retention. Another contributor believes that dreams do have meanings and can be explained through different types of memory, particularly semantic memory, which records abstract knowledge and symbolic forms. They explain that while episodic memory captures specific events, semantic memory relates to broader associations, influencing dream content. For instance, a dream about a car may symbolize past experiences or emotional conflicts. The conversation emphasizes the brain's reliance on semantic memory during sleep to create a narrative or virtual reality, suggesting that dreams are a complex interplay of memory processing and emotional reflection.