When most people think about sleep, they think about rest. But while you're asleep, your brain is hard at work performing one of its most important jobs: cleaning itself.
Scientists have discovered a specialized waste removal system in the brain called the glymphatic system. This system becomes most active during sleep, helping remove waste products that accumulate throughout the day.
Although research is still evolving, the discovery of the glymphatic system has transformed our understanding of why sleep is so critical—not only for feeling refreshed but also for maintaining long-term brain health.