The brains of people who napped several times a week were more than 15 cubic cm (0.9 cubic inches) larger than the brains of people who never had a daytime nap.
This equates to delaying ageing of the brain by between three to six years, says lead author Victoria Garfield, a senior research fellow at the MRC Unit for Lifelong Health and Ageing at UCL.
The big finding was that daytime napping is, quite robustly, causally linked to having a larger brain volume.
futurebird