How to Recover After Drinking: What Science Actually Says

*Hangovers, hydration, sleep, food and the limits of popular remedies.*

Most people have heard a "guaranteed" hangover cure. Research tells a less exciting story: some habits ease symptoms, but only time removes alcohol from the body, and no remedy has been shown to reliably cure a hangover [1]. Knowing the difference helps you recover sensibly — and avoid dangerous assumptions such as "I feel fine, so I can drive."

1. What happens after drinking?

How the body processes alcohol

After absorption, alcohol is broken down mainly in the liver — first to acetaldehyde, a toxic compound, and then to acetate. The liver works at a roughly constant pace, so drinking water, coffee or exercise do not meaningfully speed it up [2].

Why a hangover feels the way it does

Hangovers are thought to result from several overlapping processes rather than one single cause [2] [3]:

• Disrupted sleep — leading to fatigue and poor concentration
• Fluid loss — alcohol suppresses the hormone vasopressin, so you urinate more, which can cause thirst and dizziness
• Stomach and gut irritation — contributing to nausea, vomiting and stomach pain
• Immune and inflammatory responses — linked to headache, aches and feeling unwell
• Acetaldehyde exposure and low blood sugar in some people
• Mild nervous-system rebound — which can show up as shakiness, sensitivity to light and sound, or anxiety

Why it varies so much

Amount drunk, speed of drinking, food, sleep, genetics, medication and general health all play a role. Two people drinking the same amount can feel very different the next day.

2. Hydration and electrolytes

Water is helpful when you are thirsty or have lost fluids, and it can ease dry mouth and dizziness. Oral rehydration solutions can be useful if you have been vomiting or have diarrhoea, because they replace both fluid and salts [4].

What hydration cannot do: it does not make the liver clear alcohol faster, and studies suggest dehydration markers do not fully explain how severe a hangover feels [3]. Water helps symptoms — it is not a cure.

3. Food and nutrition

Eating before and while drinking slows alcohol absorption, so blood alcohol rises more slowly and usually peaks lower. After drinking, bland, easy-to-digest food (toast, bananas, rice, soup) can settle the stomach and help if your blood sugar is low [4].

Once alcohol has already been absorbed, food does not remove it. Neither does coffee or any supplement — nothing quickly "sobers you up."

4. Sleep and rest

Alcohol can make you fall asleep faster, but it disrupts sleep later in the night, reducing sleep quality and REM sleep [5]. That is a major reason why you feel exhausted the next day. Rest is one of the most helpful recovery tools.

Important: sleep does not make an intoxicated person sober quickly. Someone who is very drunk should never simply be left alone to "sleep it off" — they can vomit and choke, or their breathing can slow dangerously [6].

5. Headaches, nausea and common remedies

• Water and electrolyte drinks: sensible for thirst and fluid loss; they ease symptoms but are not a cure.
• Coffee: may help you feel more alert and can ease caffeine-withdrawal headaches in regular coffee drinkers, but it does not lower blood alcohol.
• Greasy breakfast: may feel comforting, but there is no good evidence that it treats a hangover.
• Ginger: has some evidence for nausea in other settings; evidence specifically for hangovers is limited.
• Vitamins and minerals: there is little evidence that supplements prevent or cure a hangover after an ordinary night out. See our article on supplements after drinking.
• Hangover pills and recovery products: systematic reviews have found the evidence for these products to be weak, small-scale or of low quality [1] [7].
• "Hair of the dog": drinking more only postpones symptoms and adds more alcohol for the body to process.

Painkillers — be careful

Anti-inflammatory painkillers such as aspirin and ibuprofen can irritate a stomach that alcohol has already upset [8]. Paracetamol (acetaminophen) needs particular caution after heavy drinking, with liver disease, or if there is any risk of exceeding the maximum dose [9]. There is no single medicine or dose that is right for everyone — if you are unsure, ask a pharmacist or doctor.

6. What does the research say?

• A systematic review of randomised trials in the BMJ found no compelling evidence that any conventional or complementary intervention effectively prevents or treats hangover [1].
• A more recent systematic review of pharmacologically active treatments again found the evidence to be of very low quality, with small studies and inconsistent results [7].
• Sleep research consistently shows that alcohol disrupts the second half of the night's sleep [5].
• Most remedy studies are small, short and sometimes funded by manufacturers. "Some people felt slightly better" is not the same as "proven cure."

7. When it may be more than a hangover

Call emergency services immediately if someone has been drinking and shows any of these signs of alcohol poisoning [6] [10]:

• Confusion or difficulty staying awake, or cannot be woken
• Seizures
• Slow (fewer than 8 breaths a minute) or irregular breathing
• Pale, cold or bluish skin, or a low body temperature
• Repeated vomiting
• Unconsciousness

While waiting: do not leave the person alone, lie them on their side, do not try to make them vomit, and do not rely on coffee, cold showers or sleep to reverse severe intoxication.

After long periods of heavy drinking, stopping suddenly can cause withdrawal symptoms such as shaking, sweating, anxiety or, in severe cases, seizures and confusion. This needs medical attention.

Recovery checklist

• Rest and give yourself time
• Drink fluids sensibly — water, or an oral rehydration drink if you have lost fluids
• Eat food as tolerated — bland and balanced
• Avoid more alcohol
• Be careful with painkillers and ask a pharmacist if unsure
• Do not drive while alcohol may still be in your body — check an estimate, and if in doubt, don't drive

There is no reliably proven instant hangover cure. The most effective "remedy" is drinking less in the first place — see how to prevent a hangover.

Medical disclaimer

This article is for general education and is not individual medical advice. Talk to a doctor or pharmacist about your own situation, medicines or health conditions. In an emergency, call your local emergency number.

References

• [1] Pittler MH, Verster JC, Ernst E. Interventions for preventing or treating alcohol hangover: systematic review of randomised controlled trials. BMJ, 2005. doi:10.1136/bmj.331.7531.1515
• [2] National Institute on Alcohol Abuse and Alcoholism (NIAAA). Hangovers. niaaa.nih.gov
• [3] Swift R, Davidson D. Alcohol hangover: mechanisms and mediators. Alcohol Health & Research World, 1998. PubMed search
• [4] NHS. Hangovers. nhs.uk
• [5] Ebrahim IO, Shapiro CM, Williams AJ, Fenwick PB. Alcohol and sleep I: effects on normal sleep. Alcoholism: Clinical and Experimental Research, 2013. doi:10.1111/acer.12006
• [6] NIAAA. Understanding the Dangers of Alcohol Overdose. niaaa.nih.gov
• [7] Roberts E, Smith R, Hotopf M, Drummond C. The efficacy and tolerability of pharmacologically active interventions for alcohol-induced hangover symptomatology: a systematic review. Addiction, 2022. PubMed search
• [8] NHS. Ibuprofen for adults. nhs.uk
• [9] NHS. Paracetamol for adults. nhs.uk
• [10] NHS. Alcohol poisoning. nhs.uk