People who stay up late at night are more likely to display anti-social personality traits such as narcissism, Machiavellianism, and psychopathic tendencies, according to a study published by a University of Western Sydney researcher.
Dr Peter Jonason, from the UWS School of Social Sciences and Psychology, assessed over 250 people’s tendency to be a morning- or evening-type person to discover whether this was linked to the ‘Dark Triad’ of personality traits.
The results, published in Personality and Individual Differences found students who were awake in the twilight hours displayed greater anti-social tendencies than those who went to bed earlier.
“Those who scored highly on the Dark Triad traits are, like many other predators such as lions and scorpions, creatures of the night,” he says.
“For people pursuing a fast life strategy like that embodied by the Dark Triad traits, it’s better to occupy and exploit a lowlight environment where others are sleeping and have diminished cognitive functioning.”
Dr Jonason says there may be an evolutionary basis for the link between anti-social behaviour and a preference to being awake late at night.
“There is likely to be a co-evolutionary arms race between cheaters and those who wish to detect and punish them, and the Dark Triad traits may represent specialized adaptations to avoid detection,” he says.