<!– google_ad_section_start –> Migrant worker Zhang Haichao wakes up three or four times a night. “I have to lie flat on the bed and can’t turn over. I must get up and sit for a while after sleeping for a long time, otherwise I can’t breathe,” he said. Every day it gets harder for him to breathe as his pneumoconiosis recurs. A lung transplant is his only chance of surviving.