Daytime naps linked with larger brain volume in a large study
A study of about 400,000 people linked daytime napping with greater total brain volume. The result is observational and does not prove that napping causes this effect.
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What the research shows
A study of about 400,000 people looked at daytime napping and total brain volume. The results showed that napping was associated with greater brain volume. The author describes this difference as equivalent to being about 3 to 7 years younger, a comparison that is the author's interpretation and not a direct measure of biological age.
Research of this kind observes associations between habits and brain characteristics. It does not show that napping causes the larger brain volume, and people who nap may differ from others in sleep, routine and health. Future studies would be needed to test whether napping itself plays any role.
What it means
The finding suggests a link between daytime napping and greater total brain volume in a large group. It is not yet known whether napping causes this difference, or what it means for memory or thinking health over time.
How to read it with care
This result does not replace a medical consultation. Anyone considering changes to sleep habits, routine or treatment should talk with a doctor or another qualified health professional.