Most hangovers resolve on their own within 8 to 24 hours, but what you do during that window can meaningfully speed things up or slow things down. There’s no single cure, despite what supplement companies claim. What actually works is addressing the specific problems alcohol created in your body: dehydration, inflammation, poor sleep, and low blood sugar.
Why You Feel This Bad
Understanding what’s happening inside you helps explain which remedies actually work. When your liver breaks down alcohol, it first converts it into a compound called acetaldehyde, which is significantly more toxic than alcohol itself. Acetaldehyde triggers oxidative stress, damages cells, and generates inflammatory molecules called cytokines. These are the same immune signals your body produces when you’re fighting an infection, which is why a hangover can feel so much like being sick.
Alcohol also increases your gut’s permeability, allowing bacterial toxins to leak into your bloodstream and reach your liver, where they activate immune cells and amplify the inflammatory response. On top of that, alcohol suppresses a hormone that tells your kidneys to retain water, so you lose fluids and electrolytes at a much faster rate than normal. The result is a combination of dehydration, widespread inflammation, disrupted sleep, and unstable blood sugar, all hitting at once.
Hangover symptoms typically begin six to eight hours after heavy drinking, once your blood alcohol level drops significantly. They peak sometime in the morning and ease over the course of the day.
Rehydration Does More Than You Think
Replacing lost fluids is the single most impactful thing you can do. But plain water alone only addresses part of the problem. Alcohol flushes out electrolytes like sodium, potassium, and chloride, and drinking large amounts of plain water can actually dilute what’s left even further.
An electrolyte drink, oral rehydration solution, or even broth restores that mineral balance more effectively than water alone. The sodium in these drinks also helps your intestines absorb water faster. You don’t need anything fancy. A sports drink, coconut water, or a pinch of salt in water with a splash of juice all work. Start drinking fluids as soon as you wake up and keep sipping throughout the day rather than chugging a liter at once.
Eating the Right Foods
Alcohol interferes with your body’s ability to maintain steady blood sugar levels. Sharp drops in blood sugar contribute to the shakiness, fatigue, and brain fog that make hangovers so miserable. Eating a meal that includes complex carbohydrates (toast, oatmeal, rice) gives your body a slow, steady source of glucose to stabilize those levels. Sugary foods or drinks might seem appealing, but they cause a rapid spike followed by another crash, which can make you feel worse.
Eggs are a particularly good hangover food, and there’s a biological reason for it. They’re rich in an amino acid called L-cysteine, which directly binds to acetaldehyde, the toxic byproduct your liver is struggling to clear. Research published in Alcohol and Alcoholism found that L-cysteine supplementation helped reduce hangover symptoms like nausea, headache, and anxiety in a dose-dependent way. Since L-cysteine is already part of your normal metabolism, getting it through food gives your body extra raw material to neutralize what’s making you feel terrible. Other cysteine-rich foods include yogurt, chicken, and sunflower seeds.
Sleep Is Recovery, Not Laziness
Alcohol wrecks your sleep architecture even if you were unconscious for eight hours. It increases deep sleep early in the night but suppresses REM sleep, the phase critical for emotional regulation, memory, and cognitive function. Later in the night, your sleep becomes fragmented. You wake up more often, spend more time in light sleep, and lose overall sleep efficiency. This is why you can sleep a long time after drinking and still wake up feeling exhausted.
Going back to sleep, or at least resting, is one of the most effective things you can do for a hangover. Your body clears acetaldehyde and repairs cellular damage more efficiently when you’re not also burning energy on daily activities. If you can afford a nap in the early afternoon, take it. Even 60 to 90 minutes of additional sleep can noticeably reduce fatigue and brain fog.
Pain Relief: What’s Safe and What’s Not
Reaching for a painkiller is instinctive, but your choice matters. Acetaminophen (Tylenol) is processed by the same liver pathways that are already overloaded from metabolizing alcohol. Combining the two increases the risk of liver damage, and the FDA specifically warns that people who drink three or more alcoholic beverages a day should talk to a doctor before using it. Symptoms of acetaminophen-related liver injury can take days to appear and may initially mimic cold or flu symptoms, making it easy to miss.
Ibuprofen (Advil, Motrin) or aspirin are generally better options because they don’t tax the liver the same way. They also have anti-inflammatory properties that directly target the cytokine-driven inflammation fueling your headache and body aches. The tradeoff is that they can irritate an already-sensitive stomach, so take them with food. If your stomach is too upset to eat, hold off on painkillers until you’ve managed to get something down.
What Doesn’t Actually Work
The hangover remedy market is enormous, and almost none of it holds up to scrutiny. A review by the Alcohol Hangover Research Group found that no hangover product has been proven effective in double-blind, placebo-controlled human trials. NAC (N-acetyl cysteine), one of the most popular supplements marketed for hangovers, was specifically found to be ineffective at reducing hangover severity in clinical trials, despite promising results in animal studies.
“Hair of the dog,” or drinking more alcohol, delays hangover symptoms by keeping your blood alcohol level elevated. It doesn’t resolve anything. You’re simply postponing the same process and adding more toxic byproducts for your liver to handle later. Coffee can help with alertness if you’re a regular caffeine drinker avoiding withdrawal, but it’s also a diuretic that can worsen dehydration. If you drink coffee, match it with extra water.
What You Drink Affects How Bad It Gets
Not all alcohol produces the same hangover. Dark-colored spirits like bourbon and whiskey contain higher concentrations of congeners, chemical byproducts of fermentation that intensify hangover symptoms. A study comparing bourbon and vodka drinkers found that bourbon produced significantly worse hangovers, directly linked to its higher congener content. Vodka, gin, and other clear spirits have far fewer congeners.
Beer and vodka are close enough in congener content that the difference doesn’t meaningfully change hangover severity. The bigger factor with any drink is total alcohol consumed and how quickly you drank it. But if you’re choosing between a dark whiskey and a clear spirit for the same amount of alcohol, the clear option will likely treat you better the next morning.
A Practical Recovery Timeline
If you wake up hungover and do everything right, here’s roughly what to expect. In the first hour, focus on getting fluids with electrolytes and eating something bland but nutritious. Within two to three hours of eating and rehydrating, nausea and headache typically begin to ease. Fatigue and brain fog tend to linger the longest, often persisting through the afternoon even as other symptoms fade. By 24 hours after your last drink, the vast majority of people feel functionally normal again.
The severity and duration scale directly with how much you drank. A moderate hangover from a few extra drinks at dinner might clear by lunchtime. A severe hangover from a night of heavy drinking can leave residual fatigue and cognitive sluggishness into the following day. Age, body weight, genetics (particularly how efficiently your liver produces the enzymes that break down acetaldehyde), and whether you ate before drinking all shift the timeline in either direction.