h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

 1: Immediate sweet tea or coffee for stimulant and blood sugar replacement

2: Protein i.e. cooked English breakfast

3: Fresh air and sunshine to get the blood flowing to repair the dehydrated and essential salt reduced parts of your body.

4: Plenty of fluid, preferably packed with sugar. If you are not too drunk to remember drink at leat two pints of water before you go to bed.

5: Crap TV

750g pot of natural yoghurt (unset) with 1 tablespoon (rounded) full of drinking chocolate powder. Mix well. Eat.
1 pint of water.
1 pint of orange juice.
Your stomach is now at capacity. Wait for a few minutes. Have a shower at the lowest temperature you can stand.
Dry off. Back to the kitchen, where you must make 3 sandwiches: one of cheese, one of raspberry jam and one of nothing.

Only now are you ready for coffee. Best to have another pint of water whilst waiting for the kettle/percolater.

Cold water immersion - you're body is in such a state of shock trying to deal with the temperature change that everything else is put aside.
This may be why people choose to swim in the Serpentine on Christmas morning.