Do earplugs stop noise driving critical care patients into delirium?

Do earplugs stop noise driving critical care patients into delirium? Critical care, July 2012, 16: 139.

Mills, G.H. and Bourne, R.S.

http://ccforum.com/content/16/4/139/abstract

Quality sleep is a problem for the critically ill who are cared for in an environment where interventions night and day are common, staff members are constantly present in relatively high numbers, and treatment is accompanied by a range of changing warning tones and alarms and lights. These critical care units are generally designed without a focus on patient comfort, sleep, and rest and often lack access to appropriate natural daylight. To add to this problem, critical illness, particularly sepsis, disrupts circadian rhythms and sleep patterns, and disruption of circadian rhythms, in turn, impairs immunity and contributes to delirium.