1. 2005 Sleep in America poll. National Sleep Foundation. 2005. Available from: http://www.kintera.org/atf/cf/{F6BF2668-A1B4-4FE8-8D1A-A5D39340D9CB}/2005_summary_of_findings.pdf. Accessed July 14, 2008.
2. National Sleep Foundation. How much sleep do we really need? National Sleep Foundation. 2007. Available from: http://www.sleepfoundation.org/site/c.huIXKjM0IxF/b.2417489/k.208/How_Much_Sleep_Do_We_Really_Need_Page_4.htm. Accessed October 27, 2008].
3. Schoenborn CA, Adams PF. Sleep duration as a correlate of smoking, alcohol use, leisure-time physical inactivity, and obesity among adults: United States, 2004-2006. NCHS Health E-Stats. 2008. Available from: http://www.cdc.gov/nchs/products/pubs/pubd/hestats/sleep04-06/sleep04-06.pdf. October 16, 2008.
4. Objectively measured sleep characteristics among early-middle-aged adults: the CARDIA study;Lauderdale;Am J Epidemiol,2006
5. Ethnicity, sleep duration, and sleep satisfaction;Hicks;Percept Mot Skills,1999