Re: I don't know what's going on with Irv...
Sometimes the anaesthesia can have a lingering effect on the nerves that stimulate the colon, and they have to be triggered back into action. Is he getting enough bulk-forming fiber in his diet? Usually inability to form stools is related to that. Fruits, vegetables, oatmeal, Fibercon and good hydration might help. A mild laxative like Dulcolax if that fails. Constipation affects sleep, alertness, and mood.
As a child, if I felt dull, listless, head-achy and irritable, my Jewish mother would always ask if I had a bowel movement that day. She was usually right.