Snoring, insomnia and poor sleep could be ageing your brain, raising dementia risk, study finds

Did you know that a few bad nights of sleep could age your brain faster than the calendar ever could? It turns out that struggling to sleep or waking up groggy might be slowly ageing your brain. In one of the largest studies of its kind, scientists have found that poor sleep patterns are directly linked to brains that appear older than their true biological age. The findings suggest that the effects of bad sleep go well beyond dark circles and irritability, they might be increasing the risk of dementia.

Losing sleep, losing time:

The study, conducted by researchers at the Karolinska Institutet in Sweden, used advanced MRI scans and machine learning to analyse over 27,000 brains from middle-aged and older adults. Each participant’s sleep habits were rated on five common factors; things like insomnia, snoring, daytime sleepiness, sleep duration and whether they’re a morning or night person.

The results revealed that for every point lower on the sleep quality scale, the brain’s biological age jumped ahead by about six months. On average, people with poor sleep had brains that looked nearly a year older than their actual age, and the worse the sleep, the bigger the gap.

Lead researcher Abigail Dove explained that this accelerated brain ageing may be linked to low-grade inflammation in the body. Their data showed that inflammation accounted for just over 10 per cent of the connection between poor sleep and older-looking brains. While that’s not the whole story, it’s a significant piece of the puzzle.

Also Read: 5 simple habits to improve sleep quality, wake up feeling fresh

And it’s not the only possible culprit. The researchers suggest that poor sleep could also disrupt the brain’s waste clearance system, a vital housekeeping process that mainly happens while we sleep, or interfere with cardiovascular health, which in turn could harm the brain. “These findings suggest that improving sleep could be a way to slow down brain ageing. Because sleep is modifiable, it could become a key area in the fight against cognitive decline.”

However, the team cautioned that while their findings are strong, the UK Biobank participants studied tend to be healthier than the average population, and the sleep data was self-reported, meaning people may not always be accurate about how well they sleep. Still, with dementia on the rise and no known cure, prioritising good sleep might be one of the simplest ways to protect your brain in the long run, even if you’re only in your forties or fifties.

Also Read: Dementia in India: 5 everyday habits that can help protect memory and brain health

Sleep before it’s too late:

So the next time you ignore a restless night or push through fatigue with caffeine, remember that your brain might be paying the price. Catching those extra hours could mean more than just feeling rested, it could mean staying sharper, for longer, says study.

FAQs on Insomnia and Brain Ageing:

Q: How does insomnia affect brain ageing?
A: Insomnia can lead to accelerated brain ageing by contributing to low-grade inflammation and potentially disrupting the brain’s waste clearance system, which mainly happens during sleep.

Q: Can improving sleep quality really slow down brain ageing?
A: Yes, improving sleep quality can potentially slow down brain ageing. Since sleep is a modifiable factor, better sleep habits can help protect against cognitive decline.

Q: What are common factors used to rate sleep habits?
A: Common factors include insomnia, snoring, daytime sleepiness, sleep duration, and whether someone is a morning or night person.

Q: Does poor sleep increase the risk of dementia?
A: Yes, poor sleep patterns are linked to an increased risk of dementia and other cognitive issues.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for a specific health diagnosis.