I think the parent poster if confusing general anesthesia from sedation [1]. If you got a colonoscopy or your wisdom teeth out, it was probably sedation. If you got major surgery where they cut a big hole in you, that's more likely to be general anesthesia.
"Twilight sedation" is pretty spooky from a philosophical perspective. You are somewhat aware of what's happening to you and are experiencing it in the moment. But you are unable to form long term memories of it, so after the procedure, it's like it didn't happen. But there was a point in time where they you that you were was at least somewhat conscious of the procedure.
"Twilight sedation" is pretty spooky from a philosophical perspective. You are somewhat aware of what's happening to you and are experiencing it in the moment. But you are unable to form long term memories of it, so after the procedure, it's like it didn't happen. But there was a point in time where they you that you were was at least somewhat conscious of the procedure.
[1]: https://en.wikipedia.org/wiki/Sedation