Insomnia is defined as inadequate or poor-quality sleep despite having adequate time to sleep. Insomnia may take the form of difficulty falling asleep, or middle-of-the-night or early-morning awakening. It may be a short-term problem or occur more often over a long period of time.
Over the course of a year, about one third of adults experience some level of insomnia. About 10%-15% have more severe or chronic insomnia. It may cause problems during the day, such as tiredness, a lack of energy, difficulty concentrating, and irritability.
Insomnia is not a disease. Instead, it is a result of a behavior or a symptom of an underlying mental or physical problem. There are many causes of insomnia.
Short-term insomnia is often due to temporary situations. It generally occurs in people who are experiencing one or more of the following:
Chronic insomnia often results from a medical condition. They may include:
Chronic insomnia may also be due to behavioral factors. These include:
For some people, insomnia is aggravated by:
Can't Sleep? What to know about insomnia. National Sleep Foundation website. Available at: http://www.sleepfoundation.org/article/sleep-related-problems/insomnia-and-sleep. Accessed May 15, 2013.
Insomnia. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what. Updated April 11, 2013. Accessed May 15, 2013.
Insomnia. Quick Answers to Medical Diagnosis and Therapy. Access Medicine website. Available at: http://accessmedicine.com/content.aspx?aid=3267380. Accessed May 15, 2013
Parmet S, Burke A, Glass RM. Insomnia. JAMA Patient Page. 2006 June 28.295(24).
What is insomnia? National Heart, Lung, and Blood Institute website. Available at: http://www.nhlbi.nih.gov/health/health-topics/topics/inso/. Updated December 13, 2011. Accessed May 15, 2013.
Last reviewed March 2015 by Marcin Chwistek, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.