Using responses to a questionnaire about personality and sleep timing, the researchers found that “morning people” were more likely to have higher scores on conscientiousness and lower ones in openness. They also found that people who went to bed and woke up earlier were more self-disciplined but less straightforward and less likely to seek excitement.

“Our findings have helped us to come up with two possible pathways of how personality might influence chronotype,” says postgraduate researcher Anita Lenneis, Ph.D., from the Department of Psychology at the University of Warwick. “Personality traits […] may influence chronotype through shaping people’s preferences for various social activities and behaviors which in turn, may influence what time people go to and get out of bed, or personality may influence chronotype is through active decisions people make regarding their sleep.”

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