Hangover cures are largely old wives' tales. Figuring out how to get over a hangover is done by understanding what a hangover is. Excessive alcohol causes dehydration; it does this by inhibiting your pituitary gland, resulting in a massive loss of water. For every pint of beer you drink, you'd have to drink around 4 pints of water to compensate for the eventual loss. Another issue is the loss of electrolytes, namely salt. That's partially why bar foods and snacks are fried and salty: they taste a lot better drunk because your bodily is desperately trying to maintain equilibrium. A final issue is that while you sleep, alcohol prevents you from entering REM sleep, because your body is working so hard to process it (your body sees alcohol as poison). This results in a terrible night of sleep, even if you sleep for 10 hours straight. So what's the cure? Plenty of water before, during, and after drinking. Plenty of electrolytes, particularly salt, also before, during, and after drinking. Coffee is definitely not what you want to drink. Neither is tea. Basically anything with a diuretic is going to not help at all.