I have always said that one cannot have just one autoimmune disease! I have two types of sleep apnea: obstructive and central nervous system. (My brain really does forget to tell my body to breath.) I have had this for several years, and a few years ago my doctor added an oxygen concentrator to be used with my VPAP machine. (I was upgraded from a CPAP two years ago.) I was only diagnosed with Celiac disease six months ago. I have had Fibromyalgia since I was in my late 20's and was diagnosed with Multiple Sclerosis when I was 58. I'll be 70 in two months and can't wait to see what the next decade brings.
I don't think there is any connection between sleep apnea and Celiac disease any more that I think that MS is responsible for me having other autoimmune diseases.