Alls I know is anesthesia has either changed significantly since 20 years ago or they use different knock-out drugs for different operations.
The stuff they gave me 20 years ago had a delayed effect. I made the entire OR laugh when I was expected to be unconscious but spoke the words “Good night”. I had a strong constitution back in the day, stronger than the anesthesiologist expected, evidently.
Our nurse-anestheologist was explaining to us how much the drugs have changed over the years and are nothing like even a few years ago.
And they continue to change as they find new stuff that works.