Just found this online.
http://sundownerfacts.com/sundowners-syndrome/Something to look forward to:
"Sundowner’s Syndrome is the name given to an ailment that causes symptoms of confusion after “sundown.” These symptoms appear in people who suffer from Alzheimer’s Disease or other forms of dementia. Not all patients who suffer from dementia or Alzheimer’s exhibit Sundowner’s symptoms, however. Conversely, some people exhibit symptoms of dementia all day which grow worse in the late afternoon and evening, while others may exhibit no symptoms at all until the sun goes down.
Sundowner’s Syndrome largely remains a mystery to medical science, although there are several theories about why these symptoms begin at night. More and more studies are being conducted to try to determine the exact cause."
As I recall, back in the days our Sundowners Syndromes had a lot to do with Kukri. Or maybe I'm getting confused.
Mike