How does deep sleep affect the brain?

Jim O'Shaughnessy discusses the concept of deep sleep's impact on brain functions in the context of overall brain development and health. He emphasizes the critical role that deep sleep plays in facilitating various brain functions. While the exact details from this specific clip aren't directly focused on deep sleep, O'Shaughnessy's work generally underlines the relevance of quality sleep for maintaining optimal brain health and functionality 1.