Well frankly the reason for me is because I know we will be up VERY early that morning just out of excitement and I can't eat that early (before 9 or 10 usually) and I will need to eat something good sized before boarding because I will be getting nervous - don't ask why, just me. And when I get nervous and stressed, I burn my food up very quickly. Plus we have ressies we want to get made and that may put us at not getting to eat until more like 2 or 3 (by the time we get settled, etc.). So, unfortunately I will be ready to eat again by 2 or 3 because after eating about 9, my food will have been burned out of me by then. And just eating a bagel and juice ain't gonna cut it. Plus we possibly are not going to eat a big meal the night before.