Comment on

• Practice parameters for the role of actigraphy in the study of sleep and circadian rhythms: an update for 2002.

  Littner M, Kushida CA, Anderson WM, Bailey D, Berry RB, Davila DG, Hirshkowitz M, Kapen S, Kramer M, Loube D, Wise M, Johnson SF; Standards of Practice Committee of the American Academy of Sleep Medicine. Littner M, et al. Sleep. 2003 May 1;26(3):337-41. doi: 10.1093/sleep/26.3.337. Sleep. 2003. PMID: 12749556
• The role of actigraphy in the study of sleep and circadian rhythms.

  Ancoli-Israel S, Cole R, Alessi C, Chambers M, Moorcroft W, Pollak CP. Ancoli-Israel S, et al. Sleep. 2003 May 1;26(3):342-92. doi: 10.1093/sleep/26.3.342. Sleep. 2003. PMID: 12749557 Review.
• Issues of validity in actigraphic sleep assessment.

  Tryon WW. Tryon WW. Sleep. 2004 Feb 1;27(1):158-65. doi: 10.1093/sleep/27.1.158. Sleep. 2004. PMID: 14998254