Hi , and thanks for your post. You pose an interesting issue. Generally speaking, some folks do have difficulty sleeping in the supine position. In some cases, the tongue can more easily fall to the back of the throat - this may create an obstruction. For others, increased girth or weight can create an impediment to normal quiet breathing. In some circumstances, this can be lead to sleep apnea.
There can be many reasons why sleeping on one's back may be difficult for breathing.
Have you had an opportunity to discuss this with your physician?
What are your thoughts on this?
Leon (site moderator asthma.net)