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DARIEN, IL – Declines in sleep hygiene across the college years are associated with declines in grade-point average.  Although students who are “evening types” initially experience the greatest decline in GPA from high school to college, their grades improve as they shift toward a morning chronotype, suggests a research abstract that will be presented Wednesday, June 15, in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS).

Results show that poor sleep hygiene was associated with a low­er grade-point average in high school.  Sleep hygiene worsened upon entering college, and poor sleep hygiene tended to persist through the senior year. Students whose sleep hygiene worsened dur­ing college also showed a greater decline in their GPA during college.

According to the American Academy of Sleep Medicine, sleep hygiene involves habits and behaviors that promote healthy sleep.  Common examples include establishing a relaxing bedtime routine, and avoiding caffeine in the afternoon and at night.

“Sleep hygiene is a set of voluntary behaviors that you can change,” said principal investigator and lead author Jennifer Peszka, PhD, associate professor of psychology at Hendrix College in Conway, Ark.  “If they are related to college performance, then students could make small changes that help them do better.  It makes sense and we can tell students they need good sleep to help them do well in college, but I think being able to point to empirical data is more convincing.”

The study also found differences according to “chronotype,” which reflects the time of day when a person prefers to be awake.  Students who are “evening types,” meaning that they have a natural preference to stay up later at night, showed greater declines in GPA tran­sitioning from high school to college and had a lower freshman GPA (2.84) compared with morning and intermediate types combined (3.18).  These night owls shifted significantly more toward a morning chronotype by the senior year of college, when there were no longer significant GPA differences between chronotypes.

“We found that these owls were shifting their clocks during their time in college to be more like morning larks and regular robins,” said Peszka.  “Perhaps that shift helped their academic performance improve.”

Peszka, along with co-authors David Mastin, PhD, from the University of Arkansas at Little Rock and John Harsh, PhD, from the University of Southern Mississippi, studied 89 students who gave access to their high school and college academic records.  During the summer before their freshman year of college, they completed a series of questionnaires about their sleep preferences, sleep habits and how they slept in high school.

Thirty-four participants completed the same questionnaires at the end of their freshman year in college, and 43 participants completed the questionnaires after their senior year.  Chronotype was identified using the Horne-Ostberg criteria.

The authors concluded that students may be able to improve their academic performance by understanding their chronotype and following sleep hygiene recommendations.

Last year at SLEEP 2010, Peszka, Mastin, Harsh and colleagues reported that poor sleep hygiene was related to higher scores on a measure of perceived stress among college students.  It was also associated with higher scores on both the exhaustion and cynicism subscales of a tool that measured “burnout,” a state of global exhaustion marked by excessive fatigue, reduced job efficiency and depressed mood.

The SLEEP 2011 abstract supplement is available for download on the website of the journal SLEEP at

A joint venture of the American Academy of Sleep Medicine and the Sleep Research Society, the annual SLEEP meeting brings together an international body of more than 5,000 leading clinicians and scientists in the fields of sleep medicine and sleep research.  At SLEEP 2011 (, more than 1,000 research abstract presentations will showcase new findings that contribute to the understanding of sleep and the effective diagnosis and treatment of sleep disorders such as insomnia, narcolepsy and sleep apnea.

Abstract Title: Sleep hygiene, chronotype, and academic performance during the transition from high school through four years of college
Abstract ID: 0227
Presentation Date: Wednesday, June 15, 2011
Presentation Type: Oral presentation
Presentation Time: 9 a.m. – 9:15 a.m.