I was diagnosed with COPD 5 years ago whilst still working and sleeping so badly I could hardly stay awake at my desk. I was given a CPap machine by the Brompton hospital and have never looked back really. Apparently my oxygen levels drop so low during the night that I keep waking up in a panic although sometimes I wasn't really even aware of it. Iam. Still using it and wondered if anyone else had any experience of using one.