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Interesting. Guessing this has to do with humming (or generally, vibration) increasing endogenous nitric oxide production ~15x [0]. Nitric oxide is a vasodilator, which could mitigate sleep apnea caused by a deviated septum.

0: https://pubmed.ncbi.nlm.nih.gov/12119224/




It could also just be a strengthening of the diaphragm, lungs, and throat.




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