Background & Aim: One of the responsibilities of nurses is to identify of effective factors on sleeping, because identification of these factors prevents from occurrence of sleep disorders, improves sleeping, decreases duration of hospitalization, and reduces use of hypnotic drugs.

Methods & Materials: This research is a comparative descriptive study. The population under research was included 50 nurses who were working in CCU wards and 50 patients who were hospitalized in CCU wards that were selected by interviewing and information gathering tools was a questionnaires which consisted of tow parts and for each group one questionnaire was used. The first part was included demographic specification. Second part is consisted of 56 questions (four rating) related to effective factors on patient's sleeping in the domains such as environmental factors, personal (physical and mental) factors, pre-sleeping habits and an extra question (to explain other factors with the except of factors that mentioned in sleeping). Gathered data is processed by SPSS software, 12'Th version, and for achieving to research goals, descriptive and perceptive statistical methods (such as t-test, ANOVA test, and Pearson coefficient of correlation) were used. Then descriptive statistic was used in data analysis and statistical t-tests were used to compare of these two groups opinions.

Results: The results of this research showed that environmental factors such as turned on light, pain, anxiety due to loss of job, fears of outcome of disease, connection to monitoring systems are the important effective factors on sleeping according to the nurses points of view however patients believe that phone ring, pain, anxiety from loss of job, fears of outcomes of disease, connection to monitoring systems are important.

Conclusion: According to the research results, the most important effective factors on sleeping are "turned on light", "phone ring" "pain", "anxiety from loss of job", "fears of outcome of illness", "connection to monitoring systems". The foundation of this schedule is based on identification of effective factors on sleeping according to viewpoint of patients and then eliminating the disturbing factors.