Public Release: 

Sleep duration affects risk for ulcerative colitis

American Gastroenterological Association

Bethesda, MD (Oct. 21, 2014) -- If you are not getting the recommended seven-to-eight hours of sleep each night, you may be at increased risk of developing ulcerative colitis, according to a new study1 in Clinical Gastroenterology and Hepatology, the official clinical practice journal of the American Gastroenterological Association.

"Both short and long durations of sleep have important health implications and are associated with increased overall mortality, cardiovascular disease and cancer," said lead study author Ashwin N. Ananthakrishnan, MD, MPH, Massachusetts General Hospital. "Our findings indicate that ulcerative colitis may potentially be added to this list. We found that less than six hours of sleep per day and more than nine hours of sleep per day are each associated with an increased risk of ulcerative colitis."

Researchers conducted a prospective study of women who were enrolled in the Nurses' Health Study (NHS) I since 1976 and NHS II since 1989 and followed through detailed biennial questionnaires with greater than 90 percent follow-up. The large size of the cohorts, prospective design and prolonged duration of follow-up provide a unique opportunity to examine the association between sleep duration and incident disease with sufficient power to adjust for potential confounders.

The results demonstrated that there is a "U-shaped" relationship between sleep duration and risk of ulcerative colitis, with both short and long duration of sleep being associated with an increased risk of disease. These observed associations were independent of other known environmental risk factors.

In a previous study2, also published in Clinical Gastroenterology and Hepatology last year, Ananthakrishnan and colleagues had reported that poor sleep quality, even while in remission, resulted in a two fold increase in risk of Crohn's disease flares at six months. "All these data together support a growing recognition of the impact of sleep disruption on the immune system, and the need for providers to frequently inquire about sleep duration and quality as an important parameter of health in patients with inflammatory bowel diseases," said Dr. Ananthakrishnan.

The authors acknowledge several study limitations. First, the study population consisted predominantly of white female nurses and is thus not representative of the gender and ethnic distribution in the general population. Sleep duration was also self-reported. However, the size of the study and quality of data substantiate these findings.

Future studies are warranted to better understand mechanisms by which sleep may influence intestinal inflammation.


To learn more about ulcerative colitis, review the AGA patient brochure on inflammatory bowel disease.

1 Ananthakrishnan, A. N., Sleep Duration Affects Risk for Ulcerative Colitis: A Prospective Cohort Study. Clinical Gastroenterology and Hepatology 2014: 12(11): 1879-1886

2 Ananthakrishnan, A. N., Sleep Disturbance and Risk of Active Disease In Patients With Crohn's Disease and Ulcerative Colitis. Clinical Gastroenterology and Hepatology 2013: 11(8): 965-971

About the AGA Institute

The American Gastroenterological Association is the trusted voice of the GI community. Founded in 1897, the AGA has grown to include more than 16,000 members from around the globe who are involved in all aspects of the science, practice and advancement of gastroenterology. The AGA Institute administers the practice, research and educational programs of the organization.

About Clinical Gastroenterology and Hepatology

The mission of Clinical Gastroenterology and Hepatology is to provide readers with a broad spectrum of themes in clinical gastroenterology and hepatology. This monthly peer-reviewed journal includes original articles as well as scholarly reviews, with the goal that all articles published will be immediately relevant to the practice of gastroenterology and hepatology. For more information, visit

Like AGA and Clinical Gastroenterology and Hepatology on Facebook.
Join AGA on LinkedIn.
Follow us on Twitter @AmerGastroAssn.
Check out our videos on YouTube.

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.