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What causes hangovers, blackouts and 'hangxiety'? Everything you need to know about alcohol these holidays
With the holiday season well underway and New Year’s Eve approaching, you might find yourself drinking more alcohol than usual.
So what actually happens to our body as we drink alcohol and wake up with a hangover?
What about memory blackouts and “hangxiety”, when you can’t remember what happened the night before or wake up with an awful feeling of anxiety?
Let’s look at what the science says – and bust some long-standing myths.
What happens when you drink alcohol?
When you drink alcohol it goes into the stomach and passes into the small intestine where it’s quickly absorbed into the bloodstream.
If you have eaten something, it slows the absorption of alcohol so you don’t get drunk so quickly. That’s why it’s a good idea to eat before and during drinking.
It takes your body about an hour to metabolise 10g, or one standard drink, of alcohol.
What causes memory blackouts?
We all have that friend who has woken up after a big night out and not been able to remember half the night. That’s a “blackout”.
It’s different to “passing out” – you’re still conscious and able to carry out conversation, you just can’t remember it later.
The more alcohol you drink and the faster you drink it, the more likely you are to experience blackouts.
Once alcohol in your blood reaches a certain level, your brain simply stops forming new memories. If you think of your brain like a filing cabinet, files are going straight to the bin, so when you later try to look for them they are lost.
How do I sober up?
If you’ve had too much, there’s no way to sober up quickly. The only thing that can sober you up is time, so that the alcohol can be eliminated from your body.
The caffeine in coffee may make you feel more awake, but it doesn’t help break down alcohol. You will be just as intoxicated and impaired, even if you feel a little less drunk.
The same goes for cold showers, exercise, sweating it out, drinking water, and getting fresh air. These things might help you feel more alert, but they have no impact on your blood alcohol concentration or on the effects of alcohol.
What causes hangovers?
Researchers haven’t identified one single cause of hangovers, but there are a few possible culprits.
Alcohol is a diuretic, so it makes you urinate more often, which can lead to dehydration. This is especially the case if you’re in a hot, sweaty venue or dancing a lot. Dehydration can make you feel dizzy, sleepy and lethargic.
Alcohol can irritate your stomach lining, causing vomiting and diarrhoea, and electrolyte imbalance.
An imbalance of electrolytes (the minerals our body need to function properly) can make you feel tired, nauseated, and cause muscle weakness and cramps.
Hangovers can leave you tired, dehydrated, and with an irritated stomach. Adrian Swancar/Unsplash
Too much alcohol can cause your blood vessels to dilate (expand), causing a headache. Electrolyte imbalance and dehydration can also contribute to that thumping head the next morning.
Alcohol also interferes with glucose production, resulting in low blood sugar. Not producing enough glucose can leave you feeling sluggish and weak.
Alcohol also disrupts sleep. It can make you feel sleepy at first but it interrupts the circadian cycle, sleep rhythms and REM (rapid eye movement) sleep, so later in the night you might wake up.
It can stop you from getting the quality of sleep you need to wake feeling refreshed.
Why ‘hair of the dog’ doesn’t work
There’s no way to cure a hangover, even with “hair of the dog” (having a drink the morning after). But drinking the next morning might delay the onset of symptoms, and therefore make you feel better temporarily.
Your body needs time to rest, metabolise the alcohol you have already had, and repair any damage from a heavy night of drinking. So it’s not a good idea.
If you drink regularly and you find yourself needing a drink the next morning, this may be a sign of alcohol dependence and you should talk with your GP.
Suffering from hangxiety?
Alcohol has many effects on the brain, including that warm, relaxed feeling after a couple of drinks. But if you’ve ever felt unusually anxious after a big night out you might have experienced “hangxiety”.
Over a night of drinking, alcohol stimulates the production of a chemical in the brain called GABA, which calms the brain, and blocks the production of glutamate, a chemical associated with anxiety. This combination is why you feel cheerful and relaxed on a night out.
Your brain likes to be in balance, so in response to drinking it produces more glutamate and blocks GABA. Cue that shaky feeling of anxious dread the next morning.
What can you do if you wake up with hangxiety?
To ease some of the symptoms, try some breathing exercises, some mindfulness practices and be gentle with yourself.
There are also effective treatments for anxiety available that can help. Talk to your GP or check out some resources online.
If you’re already an anxious person, drinking alcohol may help you feel more relaxed in a social situation, but there is an even greater risk that you will feel anxiety the next day.
Prevention is better than a cure
Have a drink of water between alcoholic drinks. Marvin Meyer/Unsplash
If you choose to drink this holiday season, the best way to avoid hangovers, hangxiety, and blackouts is to stick within recommended limits.
The new draft Australian alcohol guidelines recommend no more than ten standard drinks a week and no more than four standard drinks on any one day.
(If you want to check what a standard drink looks like, use this handy reference.)
As well as eating to slow the absorption of alcohol, and drinking water in between alcoholic drinks to reduce the negative effects, you can also:
set your limits early. Decide before you start the night how much you want to drink, then stick to it
count your drinks and avoid shouts
slow down, take sips rather than gulps and avoid having shots.
If you’re worried about your own or someone else’s drinking, call the National Alcohol and other Drug Hotline on 1800 250 015 to talk through options or check out resources online.
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