Turns out it’s not what side of the bed you wake up on that makes you a jerk- it’s your bedtime. Research suggests that night owls (people who prefer to stay up late) are more likely to have a set of personality traits called the Dark Triad- narcissism, psychopathy and Machiavellianism. In layman’s terms, they’re colder, more self-involved, manipulative and antisocial. Basically, they’re jerks! Just make sure you stay out of their way- at least until they’ve had their coffee.