Many of such deformed people indeed rely on a ventilator to put enough air pressure in so they don't suffocate while sleeping.

Also, sleeping in an inclined bed, or a reclined couch so the weight dosen't rest on their chest.

Of course they will reeee that skinny people can suffer from sleep apnea too. But much like Type 2 Diabetes, the leading cause and always a worsening factor is overeating -> excess fat.