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So I went to the pub last night with some friends and had a few pints of lager. When I got home I drank half a litre of water to stave off the effects of a hangover (it's caused by dehydration - the brain swells up and presses on the inside of the skull).
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I don't think this is what is really happening. I may be wrong but from what I know it works like that: Alcohol is a poison, body tries to get rid of it like it would try to get rid of an infection or a parasite (read: like when you have flu), to do so it rises up body heat level and do other tricks like releasing white globules(? is that the English word?) etc. , in the process blood takes up more space due to heating (yes, a tiny difference but enough to make a difference, veins are really thin).. then your brain hurts simply because blood has difficulty getting through the whole body loop. Having temperature doesn't help as well.
The reason drinking water after drinking alcohol helps is because you mixed up a lot of water with a lot of alcoholized (damn) liquid and your kidneys works out the bad stuff out of it better that way.
A more efficient method is to drink an alcohol glass then a water glass and so on. And go to the toilet frequently.
But I am not a doctor, I just know that from someone who was an nurse student.
My guess is: you slept well, full cycle and didn't drink *that* (i mean: enough) much and your body got rid of of more toxins than usual due to the stress (because of the alcohol processing) it endured and thanks to water you drank, then you felt healthy.