Specialists have recommended kids with concussions skip the homework.
A new study published in the journal Pediatrics says about half of kids and young adults who didn't reduce their mental strain took 100 days or more to fully recover from a concussion.
But for those who cut back the most, almost all had recovered within a hundred days, most within a couple of months.
Doctors had suspected that mental as well as physical rest shortened recovery time, but this is the first official study to back that up.
The study is considered a very important one for treating kids whose brains are vulnerable to concussion damage because they're still developing.