anesthesia
"I had this for a colonoscopy yesterday. Having never been put under before, I was curious what it would feel like, so I tried to pay close attention to what was going on. I saw the propofol go into my IV, and the anesthesiologist was asking me random questions about my job. Then I heard a nurse say my name, and I woke up in recovery, alert with no grogginess at all. It was like they turned me off for a while with the flip of a switch. Excellent experience, no side effects whatsoever. Highly recommended for this sort of procedure."