My father is 86 years old and survived bacterial meningitis 4 months ago. He has had pneumonia and exhibited sundowners syndrome. He just came home and we have never seen this behavior and were told the pneumonia could take up to 3 months to clear with the antibiotic. My father had the same behavior 2 weeks ago when first admitted with pneumonia in the hospital. Could the sundowners be due to the pneumonia? Also since he did not sleep in the hospital is there something to help so he sleeps at night and can wake up rested? We were told he has baseline dementia.