1. McKnight-Eily LR, Liu Y, Perry GS, Presley-Cantrell LR, Strine TW, Lu H, Croft JB (2009) Perceived insufficient rest or sleep among adults—United States, 2008. MMWR Morb Mortal Wkly Rep 58:1175–1179
2. Institute of Medicine of the National Academies Leading Health Indicators for Healthy People 2020—Letter Report available at: http://www.iom.edu/Reports/2011/Leading-Health-Indicators-for-Healthy-People-2020/Table.aspx (accessed 3/16/2011)
3. Agnew HW, Webb WB, Williams RL (1966) The first night effect: an EEG study of sleep. Psychophysiology 2:263–266
4. Morgenthaler T, Alessi C, Friedman L, Owens J, Kapur V, Boehlecke B, Brown T, Chesson A, Coleman J, Lee-Chiong T, Pancer J, Swick TJ (2007) Practice parameters for the use of actigraphy in the assessment of sleep and sleep disorders: an update for 2007. Sleep 30:519–529
5. de Souza L, Benedito-Silva A, Pires ML, Poyares D, Tufik S, Calil HM (2003) Further validation of actigraphy for sleep studies. Sleep 26:81–85