SOND develops AI-powered Dreambuds, closed-loop in-ear earbuds that capture 12 physiological signals and intervene in real time to coach better sleep. The Boston-based startup was founded in February 2022 by MIT graduates Yadid Ayzenberg, former Bose Head of Sleep Products, and Amir Lazarovich. It raised $7 million from investors including E14 Fund, Crosslink Capital, Ubiquity Ventures, Alumni Ventures, Meach Cove Capital, and John Abele.