Lately my 97 yr old father has really confused day vs. night. Will this pass, or only get worse? I thought it was just from a UTI, but the UTI is now over and he's still confused. I've bought him a clock with HUGE numbers, the day, the date and am vs. pm, to no avail. He also now sleeps fully clothed, no matter how much I try to get him to undress. Is this dementia or Alzheimer's?