Are Night Owls More Intelligent?

Some people are night owls, and others are morning larks.  What makes the difference may be their levels of general intelligence.

Night Owls Are More Intelligent than Morning Larks

Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called the circadian rhythm. The circadian rhythm in mammals is regulated by two clusters of nerve cells called the suprachiasmatic nuclei (SCN) in the anterior hypothalamus.  Geneticists have by now identified a set of genes that regulate the SCN and thus the circadian rhythm among mammals.

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.

Sleeping Well Manual

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