So what, right? As it happens, a person’s chronotype—or their own unique circadian rhythm patterns—can tell you something about their personality. Research by Michael Breus has suggested that those who are early risers but fade before 10 p.m. are more likely to be extroverted, ambitious and socially oriented. Those who are night owls have been found to have slightly higher rates of what are called the “dark triad” personality traits—narcissism, Machiavellianism and psychopathy.
