1. US Department of Health and Human Services. National Institutes of Health. National Heart, Lung, and Blood Institute. National Center on Sleep Disorders Research. 2003 National Sleep Disorders Research Plan. Available at: http://www.nhlbi.nih.gov/health/prof/sleep/res_plan/sleep-rplan.pdf accessed June 14, 2004.
2. National Sleep Foundation. 2002 ‘Sleep in America’ Poll. Available at: http://www.sleepfoundation.org/2002poll.cfm accessed June 14, 2004.
3. Sleep disorders and depressive feelings: a global survey with the Beck depression scale;Vandeputte;Sleep Med,2003
4. Epidemiologic study of sleep disturbances and psychiatric disorders: an opportunity for prevention?;Ford;J Am Med Assoc,1989
5. Sleep problems, health-related quality of life, work functioning and heath care utilization among the chronically ill;Manocchia;Qual Life Res,2001