Sleep-technology company Eight Sleep has secured a $100 million financing round backed by HSG, Valor Equity Partners, Founders Fund, Y Combinator and racing figures Charles Leclerc and Zak Brown. The fresh capital lifts the New York-based start-up’s total funding to roughly $260 million and will support the opening of its first retail stores as well as entry into China, one of the world’s largest consumer markets. Founded in 2014, Eight Sleep sells the Pod, an AI-enabled mattress system that tracks metrics such as heart rate, breathing patterns and sleep stages and automatically adjusts temperature, elevation and firmness. The company says the product has generated more than $500 million in sales and logged over one billion hours of sleep data, while the workforce has grown to just over 100 employees. Proceeds from the round will also accelerate development of medical-grade features. These include Health Check—which the firm claims can measure cardiovascular and respiratory patterns with up to 99 percent accuracy—an AI ‘Sleep Agent’ that creates digital twins of users to predict recovery needs, and new modes aimed at menopause and sleep-apnea relief. Eight Sleep is pursuing U.S. FDA clearance for some of the interventions as it broadens its reach beyond consumer wellness into preventive health monitoring.