Despite the cloud of misinformation, the AHRG has been able to pin down some basics. Get your blood alcohol concentration above 0.10 percent and odds are you’ll be hungover the next day; symptoms will peak about 12 to 14 hours later, when your BAC is back at or near zero. There does also seem to be some truth to the notion that vodka delivers less of a hangover than red wine or whiskey. A comparison of people who drank enough bourbon or vodka to get to between 0.1 and 0.15 BAC—which is superdrunk, by the way—showed that all of them got hangovers, but the bourbon drinkers reported theirs as significantly worse.