IRCT2017060811399N6 IRCT 2017-06-12 Vice chancellor for research, Semnan University of Medical Sciences The Effect of aromatherapy with Lavender on sleep quality among patients undergoing Coronary Artery Bypass Graft in Semnan Kowsar Hospital Aromatherapy with Lavender on sleep quality patients 2017-07-23 anticipated 60 Complete https://irct.ir/trial/11676 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Used, Assignment: Parallel, Purpose: Supportive, Other design features: Barij Essence company lavender essential oil will be used in this study. N/A Sleep disorder. Intervention 1: In the intervention group, Lavender will be dropped on a cotton ball at a rate of 2 drops and Will be kept in front of the patient's nose and patients will be asked to breathe 10 time deeply and in the following, cotton ball will be attached to the patient's clothes by using a pin and will be attached to his collar until 8 am, Then it will be separated from the patient's clothes and will be discarded. This process will be done for patients for 3 days. After each intervention, the previous night sleep quality of the patient will be assessed by using Hospital Sleep Quality Questionnaire. Intervention 2: In the control group, distilled water will be dropped on a cotton ball at a rate of 2 drops and will be kept in front of the patient's nose and he will be asked to take 10 deep breaths and in the following, cotton ball will be attached to the patient's clothes by using a pin and will be attached to his collar until 8 am, Then it will be separated from the patient's clothes and will be discarded. This process will be done for patient for 3 days. After each intervention, the previous night sleep quality of the patient will be assessed by using Hospital Sleep Quality Questionnaire.