Inclusion Criteria:  Body mass index (BMI) 25 to 35kg/m². American Society of Anesthesiologist (ASA) physical status I or II.  Exclusion Criteria:  patient's refusal Altered mental status Known allergy to study drugs (bupivacaine or morphine) Local infection at site of puncture. Known case with any pulmonary disease Known case with Obstructive sleep apnea (OSA) Coagulopathy and /or thrombocytopenia Chronic pain Severe hepatic or kidney impairment