Here is an article using a number of examples to link dementia to the asteroid Hypnos. In this post I'll use mostly the same charts to make the case that dementia is related to Pallas/Chiron connections. Maybe it's both. Or neither, as you'd want a much larger sample to seriously make a case.
Aaron Copeland: Chiron conjunct Pallas ruler Saturn
Glen Campbell: Chiron trine Pallas and sextile Pallas ruler Venus
Charlton Heston: Pallas parallel Chiron
Ronald Reagan: Pallas parallel and widely conjunct Chiron
Robin Williams: Pallas novile Chiron which is square Pallas co-ruler Saturn.
Charles Bronson: Pallas exactly quadrinovile Pallas
Barry Goldwater: Pallas quintile Chiron
Rita Hayworth: Chiron at midpoint of Pallas and Pallas ruler Jupiter
Alois Alzheimer: Pallas tightly conjunct Chiron