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Introduction Although the function of sleep is not clear, it is generally accepted that lack of sleep can affect the health of patients and may tend to delay recovery from illness (Dogan et al., 2005; Higgins et al., 2007; Jafarian Amiri et al., 2012; Venkateshiah et al., 2012). In general, hospitalization can affect patients’ quality of sleep (Reid, 2001; Venkateshiah et al., 2012). It can be related to environmental, physiological and psychological factors (Dogan et al., 2005; Honkus, 2003; Pellatt, 2007). Sleep disturbances in critically ill patients are defined as of insufficient duration or stages of sleep that result in discomfort and interference with quality of life (Tastan et al., 2010; Urden et al., 2010). One group of hospitalized patients that encounter sleep problems and symptoms of sleep disturbances are patients with cardiovascular disease (Tastan et al., 2010). Environmental stimuli in the critical care unit could be disruptive for …