I think they've got the routine pretty well wired to avoid Pt anxiety.
"OK, sit here, now lie back and relax. Yes, that's the machine over there under the plastic".
"We're going to give you something just to take the edge off. By the way what do you... <insert some casual, mundane, conversational question that I either can't remember or never actually heard>"?
Wake up in recovery.
Not like sleeping, where you have some awareness that time has passed, only others can convince you it wasn't instantaneous.