Nishino, M.D., Ph.D., is the first Japanese professor at Stanford University School of Medicine and a pioneering advocate for the importance of "high-quality sleep" in Japan. His research at Stanford focuses on sleep disorders and the mechanisms of sleep and wakefulness, emphasizing that the quality of sleep is more critical than its duration. Dr. Nishino's bestselling book has sold over 440,000 copies, significantly impacting Japanese readers. Translated into nine languages, his insights are now being shared with English-speaking audiences for the first time in The Science of Sound Sleep. In this work, he explores vital sleep concepts such as the "golden 90 minutes" and "sleep debt", asserting that a healthy circadian rhythm is essential for achieving high-quality sleep. The book offers methods for managing your body clock and core body temperature, alongside valuable recommendations for diet, exercise, bedding materials, and medication use. Grounded in scientific evidence and presented in an accessible style, The Science of Sound Sleep will undoubtedly enlighten readers and guide them toward a restful night's sleep.