Introduction: Poor sleep quality is one of the common problems in patients after coronary artery bypass surgery. The range of attitudes and levels of knowledge is recognized as effective on this problem of patients. To provide preventive services as effective, health care workers should be aware of patients’ knowledge and attitudes to effectively provide health education. The purpose of this study was to determine the status of knowledge and attitude in patients with poor sleep quality about sleep problems after coronary bypass surgery in 2013.

Materials and Methods: This was a analytic-sectional study 100 patients with poor sleep quality referred to the cardiac rehabilitation clinic of Tehran Heart Center and selected through Conveinance sampling method and completed questionnaires Pittsburgh’s standardized Sleep Quality and attitude (Dysfunctional Beliefs and Attitudes about Sleep) and researcher made questionnaire of knowledge. Data were analyzed by the SPSS 18 and Oneway-ANOVA, Independent samples T test and Pearson correlation coefficient tests.

Results: The results indicated that knowledge of patients was low about the causes and ways to overcome poor sleep quality after cardiac surgery. Only 9% of patients stated fear of dying in sleeping and 24% fear of non recovery as causes of sleep problems and only 24% expressed the use of relaxation techniques are appropriate to overcome sleep problems after surgery. The result also showed that the attitude domain toward medication assets was high. Other domains of attitude were low. There was a significant relation between knowlege and attitude (P=0.03, r= 0. 217). Also there was a significant relation between diabet and attitude (P=0.027)

Discussion & Conclusion: This research emphasized patient’s education, attention to their knowledge and attitudes, and providing accurate recommendations for them in the context of poor sleep quality.