In 2023, Valentina Paz and team from University College London and Uruguay studied 35,080 adults from the UK Biobank. Using brain scans and self-reported nap habits, they explored links between napping frequency and brain volume, adjusting for age, sex, and lifestyle factors.

A 2023 study by Paz V et al. linked regular daytime napping to larger brain volume. Analyzing 378,932 people aged 40-69 from the UK Biobank, researchers used Mendelian randomization to find that those genetically prone to napping had brains 15.8 cm³ larger, equivalent to 2.6-6.5 years less brain aging.