You can't have any sedation for a manometry (swallowing study) test because anyting at all invalidates the test, even your morning coffee. Most places won't give you anything for inserting the Bravo capsule either. If you don't gag uncontrollably there's no reason for sedation for endoscopy either. And you can refuse sedation for anything! Some docs are just lazy or insecure in their own skills and need patients sedated sothey can run more through the mill faster. Actually it's usually just a nurse who inserts the Bravo capsule and just a technician who inserts the manometry tube.