Research shows that lymphatic vessels extend to the brain and this has significant implications for a wide variety of brain diseases, including dementia, multiple sclerosis, stroke and traumatic brain injury. This system, called glymphatic, is said to be a dishwasher for the brain. Previously the brain was seen only as a bunch of nerve cells or as a computer. This finding relates to research showing the importance of sleep to help your brain function well. https://www.washingtonpost.com/national/health-science/when-scientists-saw-the-mouse-heads-glowing-they-knew-the-discovery-was-big/2017/05/19/f33cc574-246a-11e7-a1b3-faff0034e2de_story.html?