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I've had this drug a few times myself, they usually give it along with versed when you have an endoscopy or cholonoscopy. It is very tricky, I remember when waking up I felt like I could climb Mt Everest. I felt so rested, but along with the versed, which keeps you just below consciousness and able to respond to what the doc is saying to you, like "roll over on your side", or stand up and sing the star spangled banner, :) It also allows you to forget what went on. You have this feeling of focus and energy, but it is very disceptive, because for about eight hours you will probably not remember alot. I know the nurse told me after every time I had a procedure that I was very, very, difficult to wake up. They usually give you another drug to help reverse the effects of the versed and propofol. At the time I did not have sleep apnea issues, but going forward this could be a real problem. So always tell the doctors that you have apnea before any surgery, very, very important!