Abstract: Background: Sleep is a basic need much as food and water, which are necessary for human survival. Sleep is a periodic, reversible state of cognitive and sensory disengagement from the external environment with a complex physiologic and behavioral process essential for rest, repair, well-being, and survival. This study aimed to identify factors associated with sleep pattern disturbance among patients in critical care units. A descriptive design was applied in the current study. The study was conducted at critical care units (Intensive Care Units & Cardiac Care Units) at Port Said city hospitals. A convenience sample of 86 patients was included. Three tools were used for data collection; interviewing questionnaire sheet, Groningen's sleep quality Scale and Modified Sleep disturbing scale.
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