““Roberts and Kyllonen (1999) explored the relation of morningness to cognitive ability. Using 420 U.S. Air Force recruits in the sixth week of basic training, they found that cognitive ability was positively correlated with eveningness and negatively correlated with morningness. They cite Sternberg’s doctrine that flexibility is associated with intelligence, and that adapting to the electrically lighted evening hours would be an example of such flexibility. Interesting, that those of us who, evolutionarily speaking, have adapted to become night owls, and not rigidly adhered to thousands of years of early to rise, early to bed routine, show greater signs of intelligence.””
