By Dr. Sanchari Sinha Dutta, Ph.D. Reviewed by Lauren Hardaker Aug 13 2025 In a new trial, a centuries-old yogic breathing practice using a conch shell showed measurable benefits for sleep apnea, offering a simple, non-invasive alternative to conventional treatments. Study:  Efficacy of blowing shankh on moderate sleep apnea: a randomised control trial . Image credit: Eivaisla/Shutterstock.com A clinical trial conducted by researchers from the Eternal Heart Care Centre and Research Institute,