anesthesia
"Went in for my colonoscopy on Monday.  Was given propofol but I feel it took too long to totally put me out and I was horrified.  It felt like an out of body experience.  I remember it starting to take effect and I felt really sick, however, I could not move but remember telling them that I didn't like how I felt,  Trust me, typing these words will never describe exactly what I went through.  No thanks, this could be a deal breaker for me when I am due to return for my next colonoscopy in 5 years, I just might decline and take my chances.  I thought I would  be given the propofol and fall right to sleep, not the case.  Just glad I woke up."