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 ? "
According to the above context, answer the following question.
What do you know about " him " ?


None of the above choices .