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Kristen Knutson is an associate professor of neurology, working at the Northwestern University Feinberg School of Medicine. ^{[1] [2]} With researchers from the University of Surrey, she studied the mortality rate of half a million people over 6.5 years and concluded that people who self identify as "definite evening type" had a 10 percent higher mortality rate than those who identified as "definite morning type". ^[3] It was the first study of its type to look into the mortality rate of night owls.