The glymphatic system actively cleanses toxins from the brain during seven to eight hours of restorative sleep, making it essential to prioritize long sleep durations.

“That system is a very active kind of waterway channel cleansing system of the brain. We used to think that the fluid around the brain and there's ventricles, which are like lakes, and then there's just like trickling areas that that sort of passively drip through the brain overnight.”