Having read up on Ambien, and also hearing about experiences from a family member with it, I would not suggest it. In fact, it's not something I would ever take. The side effects are a bit extreme. I had a brief period of flight anxiety in the past, and took Ativan to counteract it. It worked fine, and you have plenty of time to get it out of your system before landing in CDG. I would maybe start with a very small dose of whatever you do end up taking, several days prior to your flight, to see how you react to it. Good luck!