We tend to stay at an airport hotel on the last night of our trip, esp. when the flight is going to be early. The worst feeling in the world is wishing the taxi faster through traffic to that final airport. The Hilton is one of the older open-atrium styles (shaped like a big glass triangle), based on what we saw in the lobby all the flight crews stay there. It's a 2 minute walk to the RER/bus station and the CDGVAL shuttle to your terminal, the rooms are fully soundproofed and the lobby restaurant is somewhat pricey but the food is good. Next morning you won't be able to do justice to the breakfast buffet. Only drawback, as many pricier name brand hotels do, if you want internet in the room it's some ridiculous price.
Worth considering.