Another thing that could be causing his fatigue, lack of appetite, and sleeping most of the time could be depression. Depression is too common and often undiagnosed in people on dialysis, especially those who have recently started treatment or those who have had a health setback. His dialysis clinic has a social worker who is not only there to help with financial issues, but to help people cope with having a chronic illness and needing to do dialysis. He/she would be a good person to talk with about his concerns and his hopes and dreams for the future. Perhaps they can work together with you and your family to help him succeed.
Here is a fact sheet about depression from the National Institute of Mental Health, a government agency:
http://www.nimh.nih.gov/health/publications/depression-a-treatable-illness.shtml