A fundamental aspect of human physiology is its cyclical nature over a 24-h period, a feature conserved across most life on earth. Evidence is emerging that ICU delirium, a syndrome independently associated with increased mortality and long-term morbidity from critical illness, and affecting up to 80% of critically ill patients, is a clinical manifestation of circadian dysrhythmia. There is increasing research activity investigating the impact of lighting on human health.
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