Smart People Stay Up Late and Sleep Late

There is evidence to suggest that those with high I.Q.s stay up later and sleep later.
Researchers from the London School of Economics have found that people with high I.Q.s are more likely to be night owls, whereas folks with lower I.Q.s are more likely to wake up early and function their best during the day. Other studies have found a link between "eveningness" and getting good grades in school.