Based on the context and the answer, generate a question. 

Context: He 's been waking up later and later these days , as if it 's getting more and more difficult , and that concerns me . I think the insomnia he 's been suffering is really starting to catch up with him . He has low blood pressure to begin with , and these issues with his sleep cycle are no help . " " Sanzo , low blood pressure ? "

Answer:

He has trouble getting rest



What do you know about " him " ?