Many thanks for the information, especially your experience with the didgeridoo. The participants in the experiment above practiced for 20 minutes a day/5 days a week. Is this a common routine for the instrument? Did you start playing because of your interest in the instrument or as an "experiment" to see how it would affect your sleep apnea? And if the latter, how did you measure your outcomes?
There is some data on improvements in AHI with the use of wind instruments. Singing appears to have some benefit with snoring but not with obstructive sleep apnea. At least that is my read of the literature.
