These is a lot of evidence that his health is failing. Moments of panic and confusion, and very odd behavior. Some even believe he's having that series of small strokes. Thousands of doctors have signed a petition for him to fully reveal his health condition - he only gave them 45 minutes to skim hundreds of pages, I believe, and we don't know what he's been thru this last year.
Win or lose, it's likely he'll get very quiet for a month after the election.
I hope nothing is wrong with him - but history shows candidates do lie with no problem, when they're hiding medical problems.