How long does a hangover last? An hour-by-hour timeline

Short answer

A hangover usually lasts up to a day, and sometimes longer. NIAAA, the US government's alcohol research institute, says hangover symptoms peak when blood alcohol returns to about zero and can last 24 hours or longer (1). In a controlled study of an evening of heavy drinking, symptoms were worst in the morning, eased gradually through the day, and were still present in the afternoon for hangover-sensitive drinkers (2).

How long yours lasts depends largely on how much you drank, how you slept and how fast you drank. There's no cure other than time (1). Water, food and rest make the wait easier; they don't switch it off.

If you're on day two and wondering why you still feel off, you're not imagining it. Your sleep, heart and mood often lag behind the headache.

Note: this article is for general education for adults of legal drinking age (21+ in the US) and is not medical advice. It does not encourage drinking: not drinking is always the lowest-risk choice. Don't drive while hungover or if you may still have alcohol in your blood. Confusion, vomiting, seizures, slow or irregular breathing, or being hard to wake are signs of alcohol overdose: call 911. Shaking, sweating or seeing things after you stop drinking can be withdrawal, not a hangover — get medical help. This guide is published by Welltory, which makes one of the apps mentioned. Welltory is a general wellness product and does not diagnose or treat any condition.

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What a hangover is — and why it takes time

A hangover is the group of symptoms that follow drinking too much: fatigue, weakness, thirst, headache, muscle aches, nausea, stomach pain, vertigo, sensitivity to light and sound, anxiety, irritability, sweating and increased blood pressure (1).

NIAAA lists six contributors (1):

Each of these runs on its own clock. That's why the headache can fade by lunch while tiredness and a low mood hang on until the evening — or into the next day.

A hangover timeline, hour by hour

Everyone's timeline is different, and researchers haven't mapped an exact clock for every symptom. This is a general picture built from what the studies show.

While you're still drinking and soon after. Your blood alcohol can keep rising after the last drink, as alcohol in your stomach and intestines is absorbed (3). You feel drunk, not hungover.

The night. Alcohol shortens the time it takes to fall asleep, then delays REM sleep and leads to more disrupted sleep in the second half of the night (4). In a study of 4,098 Finnish employees wearing heart monitors, heart rate during the first hours of sleep rose with the dose — by about 1.4, 4.0 and 8.7 beats per minute after low, moderate and high doses (5).

Waking up. As blood alcohol returns to about zero, symptoms peak (1). This is usually the worst part: headache, thirst, nausea, sensitivity to light and noise. In the controlled study, hangover ratings were highest at the first morning check (2).

Late morning to afternoon. Symptoms ease gradually. In that same study, they were still present in the afternoon for people prone to hangovers (2). Tiredness and poor concentration tend to linger longest.

Evening. Many people feel close to normal by evening after a moderate night. After a heavy night, symptoms can last 24 hours or longer (1).

The next day and beyond. The hangover may be gone, but your body may not be back to baseline. Sleep and heart rate often need another night or two — our guide on how long your body takes to recover after drinking covers that longer recovery.

How long each symptom tends to last

This table describes general patterns, not a clinical clock. If any symptom is severe or getting worse instead of better, see the warning signs below.

Why some hangovers last two days

"2 day hangover" is a common search, and the feeling is real. There are a few likely reasons:

• You drank more than you thought. NIAAA says the more you drink, the worse the hangover. Big pours and strong drinks add up: a 10% craft beer or a large glass of wine counts as more than one standard drink (6).

• You lost a lot of sleep. In the controlled study, people slept about 75 minutes less after drinking, and sleep quality was worse in hangover-sensitive drinkers (2). One short night leaves a debt that one more night may not fully repay.

• You drank late. Alcohol close to bedtime cuts into the second half of the night, when sleep is most disrupted (4).

• You drank darker spirits. Congeners in drinks like bourbon could worsen hangover symptoms for some people (1).

• You had a morning drink. "Hair of the dog" could contribute to and prolong symptoms (1).

• Something else is going on. A cold coming on, stress, a hard workout or a run of late nights can stack on top of a hangover.

If you feel worse on day two than day one, or develop shaking, sweating, a racing heart or confusion after stopping drinking, that may not be a hangover. Alcohol withdrawal symptoms usually begin within 8 hours after the last drink and peak at 24 to 72 hours (7). Get medical help.

What makes a hangover last longer

The one factor you fully control is the first one. Sleep, timing and drink choice can nudge the timeline; the amount of alcohol is what drives it.

Do hangovers get worse with age?

Many people feel that they do. The research is more mixed than the folk wisdom.

In a survey of 51,645 Danish adults aged 18 to 94, the tendency to have hangovers decreased with age. Younger adults were several times more likely to report hangovers, and the difference remained after adjusting for how often people binge-drank (8). The study measured how often hangovers happened, not how long they lasted, and it was self-reported.

So why does it feel worse at 40 than at 22? Possible reasons people report include poorer sleep, more medicines, less room to rest the next day, and simply noticing it more. Research doesn't give a simple answer. The practical fix is the same at any age: fewer drinks, slower pace, earlier last drink.

What you can do while you wait

There's no cure other than time (1). These steps make the hours easier:

1. Drink water regularly through the morning. Fluid loss is one of the contributors (1).

2. Eat something bland when your stomach allows: toast, crackers, a banana, soup.

3. Rest. If you can, take a short nap and plan an early night.

4. Keep moving gently. Some people feel better after a short, easy walk outside. Skip hard training — your heart rate is likely already higher (5).

5. Be careful with painkillers. The combination of alcohol and acetaminophen can be toxic to the liver (1). Ask a pharmacist if you're unsure.

6. Don't have another drink. It can prolong symptoms (1).

7. Don't drive or do risky work until you feel fully clear. A hangover can impair attention, decision-making and coordination (1).

Coffee may make you feel more awake, but NIAAA says coffee and a shower will not cure a hangover (1).

Common mistakes that stretch a hangover out

• Sleeping in, then staying up late. It shifts your body clock and makes the next night worse.

• Skipping food all day because you feel sick, then eating a huge meal at night.

• "Sweating it out" with a hard workout. Exercise doesn't clear alcohol, and your body is already under strain.

• Treating a headache with acetaminophen while alcohol may still be in your system (1).

• Drinking again the next evening before you've recovered.

• Driving the next morning because you "feel okay."

How to make the next one shorter

The best way to shorten a hangover is to drink less. US guidance describes moderate drinking as two drinks or less in a day for men and one or less for women, and notes that drinking less is better for health (9). If you choose to drink:

• Count standard drinks, not glasses (6).

• Eat a real meal first.

• Alternate each drink with water.

• Set a last-drink time well before bed, so the second half of the night is less disrupted (4).

• Prefer clear drinks over dark ones if you drink spirits (1).

• Stay well below binge levels: for a typical adult, about five or more drinks for men or four or more for women in about two hours (3).

What a hangover looks like in your body data

If you wear a watch or ring, the morning after drinking often shows a higher resting heart rate, lower HRV and more broken sleep. The Finnish study found HRV-based recovery during sleep dropped by 9.3, 24.0 and 39.2 percentage points after low, moderate and high doses (5).

This is also why "the hangover is over" and "my body is back to normal" are two different moments. The headache can be gone by afternoon while your numbers take longer. For the full picture:

• What alcohol does to next-day HRV, heart rate and sleep

• How long your body takes to recover after drinking

• What causes a high resting heart rate

Living with hangovers: the questions people ask next

How long does a hangover headache last?

It's usually worst when you wake up and eases through the day. Symptoms peak as blood alcohol returns to about zero (1). A headache that is sudden and severe, or comes with confusion, a stiff neck or vision changes, isn't a typical hangover — get medical help.

Can a hangover last three days?

A hangover itself rarely lasts that long, but tiredness, poor sleep and low mood can linger. If you feel worse over time, or have shaking, sweating, a racing heart or confusion after stopping drinking, it may be withdrawal, which peaks at 24 to 72 hours (7). See a doctor.

Why do I feel anxious for days after drinking?

Anxiety is one of the listed hangover symptoms (1), and broken sleep makes it worse. Our guide to hangxiety explains why it can linger.

Why are my hangovers longer than my friends'?

People differ in how sensitive they are to hangovers. In one study, hangover-sensitive and hangover-resistant drinkers had similar amounts of alcohol but very different mornings (2). It's not weakness — it's biology.

Am I still drunk or already hungover?

If you drank heavily late into the night, you may still have alcohol in your blood in the morning. Hangover symptoms peak once blood alcohol is back to about zero (1). Either way, don't drive.

Before you blame yourself

A long hangover can make you feel weak or careless. Before you blame yourself, look at your data. The cause is usually visible:

• How many standard drinks you really had.

• When your last drink was relative to bedtime.

• How long and how well you slept.

• What else was going on: a busy week, a cold, a hard workout.

Then pick one lever for the next one or two weeks: "last drink two hours before bed," "water after every drink" or "a real meal before any event." Notice how long the next morning-after lasts, and, if you track it, how your resting heart rate and sleep look.

When to see a doctor

Call 911 if someone who has been drinking shows signs of alcohol overdose (3):

• Confusion or stupor

• Trouble staying conscious, or can't be woken

• Vomiting or seizures

• Slow or irregular breathing

• Slow heart rate, clammy skin, very low body temperature, or bluish or pale skin

Get medical help, or call 911 for seizures, fever, severe confusion, hallucinations or an irregular heartbeat, if you have symptoms of alcohol withdrawal after heavy, frequent drinking (7).

See a doctor if:

• Your hangovers often last more than a day.

• You can't keep fluids down.

• You need a drink in the morning to feel normal.

• You notice your heart racing or skipping after drinking.

• Hangovers are frequent, or you often drink more than you planned.

How to bring this up with your doctor

What to ask, by name:

• "My hangovers seem to last longer than they used to. Could anything else explain it?"

• "Do any of my medicines interact with alcohol?"

• "Could my sleep problems or palpitations be related to drinking?"

• "Are my liver tests normal?"

What to bring: an honest count of standard drinks per week, how long your recent hangovers lasted, a list of medicines and supplements, and notes on symptoms. If you track sleep or resting heart rate, bring a few weeks that include nights with and without alcohol.

What to say if you feel brushed off: "I want to understand why alcohol affects me this way. Can we go through my drinking, medicines and symptoms together?"

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How Welltory helps — and what it cannot do

What it cannot do. Welltory is a general wellness product, not a medical device. It doesn't measure blood alcohol, can't tell you when you're safe to drive, doesn't shorten or treat hangovers and doesn't diagnose any condition.

What it can do is help you see how long the morning-after lasts for you:

1. A morning spot reading with your phone camera. Place a fingertip over the camera and flash for a spot reading of heart rate and HRV (10). Measure at the same time each morning for comparable results (11). Camera measurements don't work on Google Pixel phones (10).

2. Connect a watch or ring through Apple Health or Health Connect; available data depends on the device (12, 13).

3. Sleep Analysis with Apple Watch or Oura on iPhone, or through Health Connect on Android (14, 15).

4. Compare mornings. Look at how many days your readings take to return to your usual range after a lighter evening versus a heavier one. The goal is to understand your own pattern — not to find a way to drink more.

How we made it

We based this article on NIAAA's fact sheets on hangovers, alcohol overdose and standard drinks, CDC guidance on moderate drinking, MedlinePlus on alcohol withdrawal, a controlled study of next-day effects in hangover-sensitive and hangover-resistant drinkers (Mackus et al., Journal of Clinical Medicine, 2023), a survey of 51,645 Danish adults on hangovers and age (Tolstrup et al., Alcoholism: Clinical & Experimental Research, 2014), a real-world study of alcohol and heart rate during sleep (Pietilä et al., JMIR Mental Health, 2018) and a review of alcohol and sleep (Ebrahim et al., 2013). Search questions came from what people in the United States most often ask about how long hangovers last. For the product section, we checked every function against the Welltory Help Center on November 8, 2026.

Made with AI tools, then edited and fact-checked by the Welltory team. See our Editorial & AI policy.

Jane Smorodnikova, co-founder of Welltory, built the methodology behind how we read physiological data.

Written by Tatsiana Yashyna.