The problem with big breakfasts

I was done at a training centre near Brighton this morning. Got up at 0345 to start driving. Horrible weather and a big accident (which hadn't cleared when I came back), meant it was nearly 4 hours in the car - a small hire car. At my destination I fuelled myself on a big breakfast, only to find out that the training centre also offered a very high quality free lunch as well. Two very square meals and the early start, meant I was pretty drowsy on the way home (another 4 hours in the car), so I stopped at the services, reclined the seat and played an energergiser Pzizz - the rest of the journey was fine!