This study will provide the evidence that during the postoperative period deep breathing exercise combined with physical training can positively influence the sleep duration and quality. This study will provide the evidence that during the postoperative period deep breathing exercise combined with physical training can positively influence the sleep duration and quality.

Subjects will be randomly placed into Control group and Interventional group. The control program will consist of Deep Breathing Exercises (from Morning to night every three hours; each session consisting of 10 deep breaths with a few seconds pause between each set, for 3 days) in addition with progressive Exercises. Two daily sessions with an average duration of 25 min will be performed. In addition to the physiotherapeutic program standardized by the hospital's team of physical therapists, the intervention group will perform additional Deep breathing Exercises (from Morning to night every three hours; each session consisting of 30 deep breaths with a few seconds pause between each set, for 3 days). Deep breathing exercises will start 48 hours after extubation and full education along with the routine care (i.e.: from the fourth to sixth postoperative day).

Inclusion Criteria:

• Ability to read and write
• Stabilization of vital signs [blood pressure, pulse, respiration)
• Patient undergoing OFF Pump Coronary Artery Bypass Graft (CABG) Procedure

Exclusion Criteria:

• History of severe mental diseases resulting in hospitalization and drug treatment within the previous 6 months
• Use any kind of other complementary methods such as massage therapy, aromatherapy, etc. to treat sleep disorders for the previous two weeks
• History of sleep or respiration disorders and used CNS medications in the night.](streamdown:incomplete-link)