How Caffeine Affects Your Brain While You Sleep [Video]

SUNDAY, June 1, 2025 (HealthDay News) — Your morning cup of coffee might help you power through the day — but could it be keeping your brain too alert at night, even while you sleep?

A new study suggests that caffeine doesn’t just affect your energy levels. It may also change how your brain functions during sleep, especially in 20-somethings.

Researchers in Canada found that drinking caffeine before bed may keep the brain in a more active state overnight, a news release shows.

Published in the journal Nature Communications Biology, the study used electroencephalography (EEG) and artificial intelligence to examine how caffeine changes the brain’s behavior during rest.

“We used advanced statistical analysis and artificial intelligence to identify subtle changes in neuronal activity,” said lead author Philipp Thölke, a research trainee at the University of Montreal.

“The results showed that caffeine increased the complexity of brain signals, reflecting more dynamic and less predictable neuronal activity, especially during …