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. Author manuscript; available in PMC: 2015 Jun 23.
Published in final edited form as: Semin Cardiothorac Vasc Anesth. 2014 Oct 7;19(1):49–60. doi: 10.1177/1089253214553066

Figure 3. Factors influencing the circadian system.

Figure 3

While a regular day/night cycles with dark, quite nights are supposed to be the basis of a well synchronized circadian rhythm in humans, noise, interventions, artificial light and drugs on ICUs have proven to disrupt a functional circadian system and might lead to disease progression.