How did the bronchoscopy help and exactly what steroid helped. Thank you very much for your help which could possibly help my husband.

I doubt that you can be tired because your organs get not enough
oxygen at night. I'd be looking for other reasons

I recall after previous bronchoscopies that my tests showed much improvement so I understand the usefulness of them. Being on the cusp of osteoporosis and therefore taking prolia, I also agree that things like prednisone have their place but at the expense of bone density/strength so one needs to be aware. I have found that the downside to being on prolia at my age (80) seems to make my immune system less able to fend off germs for inevitably in spite of eg masking precautions I come down with nasty flares that further irritate my lungs. The sleep study sounds like a good idea and it would be interesting to learn from you if oxygen supplementation while you sleep makes a difference since I am wondering the same and will discuss all of the above with my pulmonologist during my upcoming appointment. I did benefit considerably from 18 sessions of active pulmonary rehab and continue to utilize what I learned at home. Good luck!