lots of water before bed usually does the trick. A teaspoon of sugar with the water probably wouldn't hurt since alcohol decreases your sugar which is part of what a hangover is.
Maybe eat some cookies and lots of water.
When I was in the army the medics used to say that breathing in some oxygen is an instant cure for when you already have the hangover.
You can buy small oxygen tanks in medical supply stores but I bet they're expensive. lol
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