I Have COPD. I Use Stiolto Inhaler Once A Day

I have COPD. I use Stiolto inhaler once a day and beuterol in between. I am unable to sleep more than 2 hrs. at a time. (I wake up feeling like I cant breathe. I use a CPAP machine and have for several years. Most recently it makes me feel clostrofobic. It never use to. As soon as I start to relax and fall asleep Im starteled and cant get back to sleep.