Most of us do it. We rely on a familiar trick to push through late-night fatigue.
It helps us stay focused, alert – or simply awake a bit longer.
But now, scientists from the University of Montreal have found that this habit doesn’t just affect your evening.
It continues to impact your brain even while you're fast asleep. And the results are more unsettling than you might expect.
The brain stays awake – even when you don’t
In the study, 40 young adults were monitored during sleep using electrodes that measured brain activity.
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One night they received a placebo. The next, they were given a mild dose of caffeine.
The results showed a remarkable shift.
Even though participants were asleep, their brains remained unusually active.
The deep, restorative sleep phases – crucial for memory processing and recovery – were weakened.
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The brain's signals became more complex, as if it was still busy solving problems from the day. In essence, it wasn’t resting at all.
Scientists warn this might interfere with the brain’s ability to recharge and consolidate memories.
Young adults most at risk
According to the researchers, younger brains are especially vulnerable.
That’s because they contain more receptors for a chemical called adenosine, which naturally makes us feel sleepy.
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This everyday habit blocks those receptors and keeps the brain artificially awake.
Long-term, the consequences may include reduced concentration, memory issues, and poor sleep quality – even if you think you’ve slept through the night.
So next time you reach for a coffee, it might be worth reconsidering. Because while your body is asleep, your brain might still be fighting to switch off.
The article is based on information from Illustreret Videnskab.
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This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.