This certification provides the most up-to-date knowledge on the biological, personal, and societal importance of sleep. Emphasizing personal relevance, it highlights that the quality of sleep is the single best predictor of daytime performance. Practitioners will explore how the brain actively generates sleep and how factors such as sleep deprivation, jet lag, and substances like alcohol, caffeine, and nicotine affect sleep and wakefulness at the cellular level. The certification covers sleep-dependent physiological changes and sleep disorders, focusing on conditions like excessive sleepiness, insomnia, and autonomic control changes during sleep. It also addresses the effects of chronic sleep deprivation on immune function and its potential link to obesity. The importance of sleep for preventive medicine is emphasized, including the higher frequency of deaths between 4:00 and 6:00 a.m. On a societal level, the certification explores the risks of fatigue-related errors in critical fields like transportation, healthcare, and energy production. Practitioners will study how sleep deprivation has contributed to major accidents such as nuclear plant failures, transportation disasters, and medical mistakes, underscoring sleep’s crucial role in public health and safety. This certification equips practitioners with a deep understanding of sleep’s impact on individual well-being, as well as its broader implications for societal safety and health systems.