This doctor turned a stroke at 24 into a $75 million bet on smart rings. Read his pitch deck.

Dustin Freckleton tests Happy Health's smart ring against traditional sleep-testing equipment.

Dustin Freckleton Happy Health says it has raised $75 million since 2019.

The startup builds an AI-powered smart ring to help doctors diagnose sleep apnea.

Dustin Freckleton founded the company after having a stroke in medical school.

At 24, Dustin Freckleton suffered a stroke during his first year of medical school that left him temporarily paralyzed on one side of his body and searching for answers.

Nearly seven years later, he was diagnosed with sleep apnea — a disorder where airways are blocked during sleep, and that is linked to increased stroke risk.

Freckleton also said he had atrial fibrillation , an irregular heartbeat.

The health challenges led him to found Happy Health, a startup building an AI-powered smart ring that aims to help physicians diagnose sleep apnea in days.

The company emerged from stealth on Tuesday after raising $75 million across multiple rounds since 2019 from ARCH Venture Partners and OpenLoop.

Freckleton said both have continued to back Happy Health as it has crossed milestones such as manufacturing, clinical validation, and Food and Drug Administration clearance for its ring.

The last tranche of funding closed in 2025.

Freckleton said tens of thousands of people have used Happy's platform to date.

He declined to disclose the company's valuation or revenue.

Happy Health says it builds more than a smart ring Happy's ring collects biometric data while users sleep and analyzes it with AI.