What is one important function of sleep for the brain?

One important function of sleep for the brain is to allow cerebrospinal fluid (CSF) to flush out waste products. During sleep, the brain experiences a unique state that facilitates the removal of neurotoxic waste accumulated during wakefulness. This process is crucial for maintaining proper brain function and preventing neurodegenerative diseases. The CSF circulates between brain cells more effectively during sleep, helping to cleanse the brain of metabolites and toxins such as beta-amyloid, which are associated with conditions like Alzheimer's disease. This detoxification process underscores the vital role sleep plays in cognitive health and overall neurological wellbeing.