Most people seem to have more bad dreams early in the night, progressing toward happier ones before awakening, suggesting that they are working through negative feelings generated during the day.
Teens with all three of the negative lifestyle factors were 3.4 times more likely to have frequent headaches than those with none of the negative lifestyle factors.
He did this by having them watch movie clips that either invoked happy or sad emotions, and asking them to dwell on positive or negative aspects of their own lives.
In the study, neuroticism was measured as a tendency to experience negative emotion - neurotics get upset and irritated easily, are moody, and worry a lot.