Don't worry about it! Cathay Pacific F/As are extremely flexible in serving you anything at anytime you want. If you want to switch the supper and breakfast schedule, you can tell the F/As... I am sure this can be arranged.
For midnight menus, the service began with the caviar and salmon cart, and then the rest of the meals are a la carte -- usually a soup, a salad, two western entree choices, two Chinese favorites, light bites such as pizza and pasta, and various Chinese snacks such as noodles and congees, and then dessert -- cheese plate, Chinese dessert...
You will enjoy the flight for sure!
Carfield