Did you ever notice that when you drink alcohol you piss more than you drink. That’s because it make your body dehydrate, piss away some of the water you had in your body. This include the water in your brain, your brain shrink and this is the sensation of hangover. By drinking water you are less dehydrated when you go to sleep and don’t have as much of an hangover the next day. But it doesn’t help you in the moment, just for the next day.
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