“Morningness-Eveningness and Intelligence: Early to Bed, Early to Rise Will Likely Make You Anything but Wise!”, Richard D. Roberts, Patrick C. Kyllonen1999-12 (IQ, sleep)⁠:

Research examining various psychological correlates of circadian type (also known as diurnal preference) has been, over the years, quite expansive. A notable omission within this research program would appear a systematic exploration of the relation between intelligence and morningness-eveningness. The present study redressed this imbalance.

420 participants performed two self-report inventories assessing circadian type, as well as measures of intelligence from two psychometric batteries: CAM-IV [Cognitive Abilities Measurement (Version IV) Battery] and the ASVAB.

The results indicate that, contrary to conventional folk wisdom, evening-types are more likely to have higher intelligence scores.

This result is discussed in relation to current theories concerning the nature of human cognitive abilities.

[Keywords: circadian rhythms, diurnal preference, morningness-eveningness, intelligence, working memory, processing speed]

See Also:

• Cognitive correlates of general intelligence: Toward a process theory of g

• Genome-wide association analyses of chronotype in 697,828 individuals provides new insights into circadian rhythms in humans and links to disease

• Morningness-eveningness and educational outcomes: the lark has an advantage over the owl at high school