To get less horoscopey: Kanazawa and Perina found a correlation between "eveningness" or being a "night owl" with higher childhood IQs, in a study of about 15,0

To get less horoscopey: Kanazawa and Perina found a correlation between "eveningness" or being a "night owl" with higher childhood IQs, in a study of about 15,000 adults. They conclude that the correlation is due to more intelligent people being more likely to espouse "evolutionarily novel values." The paper is here at LSE: http://personal.lse.ac.uk/Kanazawa/pdfs/PAID2009.pdf http://personal.lse.ac.uk/Kanazawa/pdfs/PAID2009.pdf