It seems that it might become that way, as this has happened to me a few times now since herniating the disc. A big part of the problem is the location of the bulge, and the physiological structure of my spine. The lower portion of my spine is inordinately curved, with my L5 and S1 being more or less fused according to the MRI. Thus, when I sleep on my stomach, with the abdominal tire adding extra weight right at that pressure point, the disc really gets pushed into the nerve.
I'm really hoping it becomes less common once I sleep at another position minus the excessive abdominal fat.