What is the glymphatic system?

The glymphatic system is a waste-clearance network in the brain. Its primary role is to flush out metabolic waste products and toxins that build up in the spaces between brain cells.

It functions similarly to the lymphatic system in the rest of your body, but it is unique to the central nervous system. Here is how it works:

• Cerebrospinal Fluid (CSF): The system uses a flow of cerebrospinal fluid to "wash" the brain.
• The "Cleaning" Process: CSF moves through the brain tissue, picking up waste products—including proteins like amyloid-beta, which is associated with Alzheimer's disease.
• The Role of Sleep: This process is most active during deep, slow-wave sleep. When you sleep, your brain cells physically shrink slightly, creating more space for the fluid to flow and clear away waste more efficiently.

In short, the glymphatic system is essential for maintaining brain health by acting as a biological cleaning crew that operates most effectively while you rest.