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Early risers prefer to gather knowledge from concrete information. 
They reach conclusions through logic and analysis. Night owls are 
more imaginative and open to unconventional ideas, preferring the 
unknown and favoring intuitive leaps on their way to reaching 
conclusions. ... Morning people are more likely to be self-controlled 
and exhibit "upstanding" conduct ... Evening people, by contrast, are 
"independent" and "nonconforming," and more reluctant to listen to authority

http://www.theatlantic.com/doc/200712/primarysources

www.peoplewho.org