Remember there are no miracle hangover cures, drinking water will help re-hydrate you, but high fat/sugar foods and drinks will only make you feel worse in the long run. There's nothing wrong with a cooked breakfast the morning after if that's what takes your fancy, just make it healthier by grilling your bacon, poaching your eggs and make it wholegrain toast instead of white. Adding tomatoes and mushrooms will balance out your plate, providing 1-2 of your 5 a day.