I recently saw this study, but it's almost 20 years old, I don't know if there's more recent data available. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13603

I recently saw this study, but it's almost 20 years old, I don't know if there's more recent data available. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1360393/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1360393/ "Didgeridoo playing as alternative treatment for obstructive sleep apnoea syndrome: randomised controlled trial"