Drinkers across England are losing valuable sleep and disrupting vital brain functions without knowing their boozing is the cause, new research for the Government's Know Your Limits campaign has revealed.

Over half (58%) of nearly 2,000 drinkers surveyed by YouGov didn't realise that drinking above the recommended daily limits can cause sleep problems, with more men (63%) than women (53%) unaware of the link.

Almost half (45%) of those surveyed admit to experiencing tiredness the day after drinking over the recommended daily limits, but it seems many people don't realise this could be due to alcohol-induced sleep deprivation.

Did you know?

Alcohol can be a headache in various ways, including its impact on sleep:

- Too many loo breaks... Alcohol stops the brain from releasing an important chemical, called vasopressin, which normally regulates the amount of water in your body. This dehydrates the body and sends you running to the loo all night!

- Dehydration... Booze encourages too much water to be flushed out of your body which will dehydrate you, putting your body under strain and contributing to a headache that can stop you sleeping.
v - Your brain can't hurt! However, while you may feel like you hangover headache is caused by your brain hurting, your brain actually can't feel pain because it has no pain receptors. In fact, while the headache may feel as if the brain is banging against the skull, the pain is actually coming from the inner lining of the skull and the blood vessels.

Contrary to popular opinion that dozing off after a couple of glasses of wine or passing out after a night of heavier drinking is the start of a deep sleep, the Know Your Limits campaign reveals that drinking late in the evening, before you go to bed is actually far more likely to prevent you getting the quality sleep your body needs. Instead, you could be upsetting your sleep patterns, encouraging dehydration and altering the blood pressure of the brain, leaving you far from fresh the next day.

Jessica Alexander, spokesperson for the Sleep Council said: "Although many people may feel alcohol helps them get off to sleep, it is also a major culprit for disrupting your night as it can interfere with the body's chemical processes needed for sound sleep. Waking up deprived of the vital sleep your body needs will leave you feeling drained and, if experienced night after night, can seriously affect your health and wellbeing."

The so-called 'drinker's false dawn' - waking early after a heavy night's drinking - is caused by the way alcohol disrupts the crucial 'REM' stage, which is essential for a deep, satisfying night's sleep. Alcohol stops you reaching this stage early in the night, meaning your body has to catch-up later in the night. REM sleep is also believed to be important for the creation of memories, which is one reason why heavy drinkers can sometimes wake up unable to remember parts of their evening.

The NHS recommends women do not regularly drink more than 2-3 units a day (a large 250ml glass of 12% wine is 3 units) and men do not regularly drink more than 3-4 units (a pint of 5.2% beer is 3 units). Over ten million adults in England regularly exceed these limits, affecting their general day to day health, but also increasing their risk of serious illnesses such as heart disease, stroke, liver disease and various cancers.

Jessica added: "If you find yourself drinking above the recommended daily limits most days of the week, your body may be constantly trying to catch up and then it's likely you'll never feel fully alert or equipped to deal with the stresses and strains of daily life."

The chemical processes of sleep are not the only function of the brain that are disrupted by alcohol, according to neuroscientist Dr Barry Gibb, author of the Rough Guide to the Brain.

He said: "Anyone who enjoys alcohol knows that, after a few drinks, they start to need more frequent trips to the loo. But many don't realise this is actually a sign that they are starting to dehydrate. This can seem strange when you're taking on more liquid than normal, but what is actually happening is that alcohol stops the brain from releasing an important chemical, called vasopressin, which normally regulates the amount of water in your body.

"With this chemical turned off, your body starts misbehaving and gets rid of the liquid in your body more quickly than it should. Water makes up about 80% of the brain and is an essential element in keeping it working smoothly, so dehydration doesn't just cause headaches but can put stress on all of the brain's normal processes - not helpful at a time when the body is working extra hard to get rid of toxic chemicals."

While some people in the YouGov survey thought alcohol makes the brain 'swell', 'shrink' or even 'pickle', Dr Gibb explains that this isn't the case at all.

"People might be surprised that the brain itself cannot feel pain. While the thumping, pulsing hangover headache may feel as if the brain is pressing against the skull, the pain is actually coming from the inner lining of the skull which contains numerous blood vessels with all their associated pain receptors."

Regular drinkers keen to cut back on their intake and get a better night's sleep - and a happier brain - should visit nhs/units, where an interactive units calculator can help you keep track of how much you're really drinking.

Department of Health, UK

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