Your Cleaning Crew: The Glymphatic System
The brain has its own unique waste removal system, called the glymphatic system. Similar to the body’s lymphatic system, this network is responsible for clearing out waste—but it’s specific to the brain.
One of the glymphatic system’s jobs is to remove harmful proteins like beta-amyloid and tau, which are associated with Alzheimer’s disease and other neurological conditions.
Why Deep Sleep Matters
This glymphatic system cleaning process kicks into high gear during deep, non-REM sleep. That’s when the glymphatic system becomes most active, efficiently washing away waste products that build up during the day.
When sleep is disrupted or insufficient, this cleaning process is impaired. Over time, this may increase the risk of cognitive decline and dementia.
Brainwashing in Action
Researchers have found that a molecule called norepinephrine is released during deep sleep. It causes blood vessels in the brain to contract in rhythmic pulses—helping to physically push waste out, almost like a rinse cycle for your brain.
This nightly "brainwashing" is essential for protecting memory, thinking, and overall cognitive function. Prioritizing good sleep isn’t just about feeling rested—it’s about long-term brain health.