" ... some people are biologically predisposed to be not only more
conscientiousness but also healthier. "Not only do they tend to avoid
violent deaths and illnesses linked to smoking and drinking," they
write, "but conscientious individuals are less prone to a whole host
of diseases, not just those caused by dangerous habits." The precise
physiological explanation is unknown but seems to have to do with
levels of chemicals like serotonin in the brain."
http://www.nytimes.com/2011/04/19/science/19longevity.html?_r=2&pagewanted=all
"People Who experience mood swings, fear, voices and visions"