When I'm travelling I'm quite often extremely busy the night before with packing and various other things that have to be done before I go away. Typically I will have only had three or four hours sleep, gone to work for the morning, thence to the airport. I know others who typically get very little sleep the night before they go away anywhere.

Also, if you don't take the trouble to have at least a light lunch before you board BA1, you're going to get very hungry,