Happy Health Raises $75M for AI Smart Ring That Diagnoses Sleep Apnea in Days

Happy Health, a startup founded by physician Dustin Freckleton, has emerged from stealth after quietly raising $75 million across multiple funding rounds since 2019. The company's core product is an AI-powered smart ring designed to help physicians diagnose sleep apnea — a condition that affects tens of millions of Americans and frequently goes undetected for years. The most recent funding tranche closed in 2025, with backers ARCH Venture Partners and OpenLoop participating across multiple rounds.

Freckleton's founding story is unusually personal: at 24, during his first year of medical school, he suffered a stroke that temporarily paralyzed one side of his body. Nearly seven years passed before he was diagnosed with sleep apnea — a disorder in which airways repeatedly collapse during sleep and which carries elevated stroke risk. He also has atrial fibrillation. That diagnostic odyssey directly shaped Happy Health's mission to compress the detection timeline from years to days.

The product goes beyond simple biometric tracking. The ring collects sleep data and runs it through AI models, but the company has built an integrated care platform around it: after testing, users can consult with physicians in Happy's network who can formally diagnose sleep apnea and prescribe treatments like CPAP machines or dental devices. The all-in package — ring, a year of sleep tracking, and physician consultations — costs $396 out of pocket and is often covered by insurance. Freckleton draws a sharp line between Happy and wearable rivals: the Oura ring, he argues, tells you your sleep is bad; Happy's platform actually fixes it.

Tens of thousands of people have used the platform so far, according to Freckleton, though he declined to share revenue figures or the company's valuation. Happy has cleared key milestones including manufacturing, clinical validation, and FDA clearance for its ring. Looking ahead, Freckleton sees sleep apnea as a beachhead — the company chose it because of its massive undiagnosed population and its links to serious chronic conditions including heart disease and diabetes — with plans to expand the ring's monitoring capabilities to other conditions over time.