anesthesia
"I had propofol for a colonoscopy and was out like a light (and didn't feel a thing) withing 30 seconds of it being administered. I slept for 2 or 3 hours after I got home, but mostly attributed it to not getting enough sleep the night before. Here it is a day later and I am still lagging a little. Still I'd rather feel a little tired than the discomfort of a colonoscopy. I had no other side effects at all!"