I tossed and turned a little … and then slept deep, calm, undisturbed sleep until a few minutes before my alarm went off. The ring gave me a 91 for sleep with abundant deep-stage sleep.

With the global sleep apnea device market valued at $8.52 billion in 2024 and projected to rise to nearly $13 billion by 2030, according to one 2025 report, medical tech companies are developing ...

But for a different take, there are sleep experts like Dr. Justin Fiala, a pulmonary, critical care and sleep medicine physician at Northwestern Medicine Canning Thoracic Institute.