1. 2004 Sleep in America Poll. (2004). Retrieved April 17, 2006, from http://www.sleepfoundation.org/_content//hottopics/2004SleepPollFinalReport.pdf
2. Sleep timing and quantity in ecological and family context: A nationally representative time-diary study;Adam;Journal of Family Psychology,2007
3. Adolescent sleep needs and patterns: Research report and resource guide. Retrieved April 17, 2006, from http://www.sleepfoundation.org/_content/hottopics/sleep_and_teens_report1.pdf
4. Sleep-related problems among children and adolescents with anxiety disorders;Alfano;Journal of the American Academy of Child and Adolescent Psychiatry,2007
5. Normal sleep in neonates and children;Anders,1995