Caffeine Linked to Less Sleep, Smaller Brain Areas
A study of children aged 9 to 11 links higher caffeine intake to shorter sleep and differences in brain structure.
Updated on Nov. 2, 2026 in Children’s Health
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A study of more than 9,600 children aged 9 to 11 found that those who drank more caffeine slept less and had a smaller surface area on the outer layer of the brain. The research was published in Biological Psychiatry Cognitive Neuroscience and Neuroimaging.
Why it matters
Soft drinks were the main caffeine source for this age group, and brain differences appeared even at one caffeinated drink a week. The findings suggest insufficient sleep may help explain the changes, though the study does not prove caffeine alone causes them.
The observational study of more than 9,600 children aged 9 to 11 compared caffeine intake with sleep patterns and brain scans, finding smaller outer-brain surface area even at one caffeinated drink a week. Whether caffeine itself drives these differences, rather than related sugar intake or lifestyle factors, remains unresolved.
The players
King's College London
A London university whose researcher served as senior author of the study, which linked childhood caffeine intake to sleep and brain structure differences.
The details
Researchers measured caffeine consumption, sleep habits and brain scans of the children, then analyzed the data to compare intake with sleep and brain structure. Children who drank more caffeine slept less and had more mood, behavior and attention symptoms.
Timeline
Article on the study findings was published on 2 November 2026.
Health Landscape
Nearly two-thirds of teenagers drink caffeine weekly, according to other studies, making childhood intake a widespread public health question. This study adds brain-structure findings to a body of research on how stimulant consumption intersects with sleep in developing children.
Parents may consider how much caffeine children consume through soft drinks, since the study tied intake to shorter sleep. The findings do not establish a safe threshold, so families should weigh sleep and overall diet when making choices.
The takeaway
Protecting children's sleep may be one practical step in limiting caffeine, especially from soft drinks. Parents can start by checking how often caffeinated drinks appear in a child's daily routine.
Further reading
Explore more in our Children's Health coverage.
Source note: This article includes information reported by ARY News.
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