Why Night Owls Are More Intelligent than Morning People

Some people are night owls, and others are morning larks. What makes the difference may be their levels of general intelligence. However, humans, unlike other mammalian species, have the unique ability, consciously and cognitively, to override their internal biological clock and its rhythmic outputs. In other words, at least for humans, circadian rhythm is not entirely a matter of genetics.

Within broad genetic constraints, humans can choose what time to go to bed and get up. Humans can choose to be night owls or morning larks.