Hey James! I see you joined up a couple years ago, but it appears that you're still a little bit "green", as it were, so let me present you with a belated welcome to the forums. Kleiner has covered an important point, being that there is a little bit of variation from provider to provider, especially from country to country. We definitely can't take a wild guess as to what you might get, but I think we can answer your question.
Really, the only safe thing to do when dealing with Anesthesia, even if it's only partial-sedation is to be completely up front and honest with your Anesthesiologist, because they basically use a combination of math and observation to determine what they need to do to put you out. I would recommend either not using the Temazepam (Restoril) if you do not need it or to definitely inform your Anesthesiologist if you already have Benzodiazepines on board.
Does that answer things for you? There's absolutely no need to pre-medicate in these situations and it's actually a pretty dangerous thing to do. Granted, the Anesthesiologist is not likely to let you die under any circumstances, but people make mistakes and you do not want to contribute to that risk unnecessarily.