Hangovers only exist because it keeps us from partying and drinking and going nuts every single night. It's a fail-safe for humans so we don't all devolve into skinny blonde mid-twenties actresses at once. It's payment for fun. It sucks. But what's the real science behind it? It all boils down to three things.
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3 ibuprofen and a bottle of water right before going to bed does wonders for me.