There’s no rest for the brain’s mapmakers
Grid cells that rats use for navigation remain active even during sleep, studies show
![sleeping rats](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/10/101117_ls_sleepingrats_feat.jpg?fit=860%2C460&ssl=1)
DREAM MAP The brain’s mapmaking grid cells keep doing their jobs, even as rats sleep, two new studies find.
Ukki Studio/Shutterstock