Hi Sean,
A sleep disorder is often just a symptom of something emotionally disturbing. We have all these labels for disorders these days, particularly those dealing with our mental health, however very little is actually known about the basic functional mechanisms of the brain.
My personal opinion is that we are quite over-diagnosed with terms that are not very well understood, in order to prescribe us expensive meds.
Very often difficulty breathing is caused simply by something that you may be struggling with in your life.
Out of curiosity...
Is there something worrying you besides the sleep?