Objective: The effect of deep breathing exercises on sleep quality in patients undergoing coronary artery bypass graft, Study Design: A clinical trial is a research study population: patients admitted to intensive care cardiac hospital in the heart of BouAli sina who are candidates for CABG. samples studied: 60 patients eligible for randomly divided into two groups of 30 patients randomly assigned to the inclusion criteria: patients in the hospital, BouAli Sina open heart candidates Qazvin, informed consent of the patient to cooperate in the study, stable vital signs, age above 18 years and below 65 years, no history of mental nerve in the six months leading to hospitalization or medication nerves, the lack of use of complementary therapies sleep disturbances during the past two weeks, over a week before being grabbed not use drugs, Exclusion criteria: unstable vital signs, leading to changes in vital signs associated with medication orders are changed or added dose of Tranquilizers by the physician., leaving the hospital with the patient's responsibility, unwillingness to cooperate during the study, history of sleep disorders, intervention or interference in the study: intervention group patients do deep breathing exercises days after surgery under circumstances where the situation is stable it is a day for 3 days and every 3-4 hours, 4 to 5 times, conduct and control respiratory care routine in performing the variable study quality was sleeping on the steps before surgery and on the first, second and third do breathing exercises was measured.