Sleep episodes over the course of a 24-hour period in the intensive care unit

Each row represents an individual patient over a 24-hour period while in the intensive care unit. The black areas represent sleep time. The white areas represent awake time.

Reprinted with permission of the American Thoracic Society. Copyright © 2001 American Thoracic Society. Freedman NS, Gazendam J, Levan L, et al. Abnormal sleep/wake cycles and the effect of environmental noise on sleep disruption in the intensive care unit. Am J Respir Crit Care Med 2001; 163(2):451-7. The American Journal of Respiratory and Critical Care Medicine is an official journal of the American Thoracic Society.

Graphic 107170 Version 1.0

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