Conscious Sedation Risks for Conscious Awake Sedation: Common: Short-term memory loss that is usually brief, feeling drowsy, not being able to think clearly, decreased blood pressure and decreased respiratory activity (abnormal breathing); Uncommon: Very low blood pressure, respiratory insufficiency (not breathing well enough to meet your body’s needs), nausea and vomiting, abnormal heart rhythms, and a severe allergic reaction that could cause death; Severe, Life-threatening and Rare: Breathing stops completely, the contents of the stomach get into the lungs, and low blood pressure that is severe enough to stop the heart."