I have and am going through this its emphasema (copd)with me on steroids a lot ,22% of lung function going for me ,had tests and then scan was told lungs full of holes ,doesnt get better for me ,trying to control breathing very important i have found .When you are sleeping brain slows down breathing rate lowers result not enough oxygen in blood symptoms headache ,dizzy and unsteady on feet i think the name is sleep apnia hope things are not so bad for you ,regards!