# Your Brain Cleans Itself While You Sleep – Scientists Just Discovered How Fast > Source: > Published: 2026-09-12 11:13:12+00:00 AI reveals a striking two-speed cleanup system that helps the sleeping brain clear away harmful waste. During deep sleep, a waterlike fluid moves through and around the brain, helping remove metabolic waste associated with disorders including Alzheimer’s disease. This cleanup process is known as the glymphatic system. It was first described in 2012 by Maiken [...]