Mom has mid-stage Dementia, obviously advance. I say mid stage in that she can still get dress, eat, and laugh at stories we tell and recognizes her children. Her only other ailment is Hypertension and early kidney disease. Her hypertension has been regulated for years by her medication and the kidney disease was just recently revealed. (one kidney if perfectly fine and functional, one had three spots on it). No diabetes, no recent stroke (small undetected one las year showed on CT). All of her tests were negative and chest x-ray clear. What could be causing her to sleep mid-day so much?