Just plan not to lose any fat that day or possibly gain even, especially if you continue to eat carbs for the rest of the night.  The non carb portion is where you tell your body to break things down, with hopefully fat being the biggest/only thing being broken down. Then the back loading part is when your body starts building muscle granted that you worked hard enough to allow the carbs you'll be taking in with minimal fat or no fat gain.  If you start this process too early or go too long eating carbs, especially on a day off depending on your body composition, weight, and the intensity of last night's session you could see quite a little fat accumilation for that day.Just fyi for next time if you've eaten it already ^^;