Somewhere between 50 and 70 million American adults suffer from a sleep disorder, according to figures from the American Sleep Association cited by Global Market Insights. 

That staggering number points to a widespread health issue, and it's fueling a booming market for sleep-enhancing solutions. As more people turn away from clunky wearables and uncomfortable earbuds, a clear trend toward non-invasive sleep technology is reshaping the industry. 

Among the companies meeting this demand, Pillowsonic Symphony often comes up as a standout example, offering a personal audio experience for bedtime without any need for headphones.