An LA Times piece describes the importance of a good night’s sleep.

Your brain uses sleep time to catch up on important chores, says  Dr. Alon Avidan  , professor of neurology and director of the UCLA Sleep Disorders Center. These include organizing memories, making repairs, and clearing out the mess that has accumulated during the day, including harmful neurotoxins.

“Without enough sleep, your brain can’t go through this cleaning process,” Avidan says.