A recent HNF CMT Update newsletter shared these results from a survey where a lot of CMTers indicated they have some kind of respiratory problem. CMT1 seems to be the most affected. I would guess sleep apnea is under-diagnosed, but it and shortness of breath are both likely to be worse with age, lack of exercise, and weight gain, which tends to come with mobility loss, pain, and fatigue.
CMT Blog 
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