Found this on Cecils article about hangover and curing it: “While we’re on the subject of things not to do, don’t head for the sauna on the theory that you’ll sweat the alcohol out of your system. You’ll just give yourself an
even worse case of dehydration.”
Now, every Finn knows that sauna is one of the best things in the morning to cure hangover. But we also know that when one baths in sauna one must drink enough to quench the thirst.
Now some say that it’s not the sauna but the drink, but alas I usually drink only mineral water in sauna and I can say that it, the sauna, cures a hangover.