Watch Spinal Fluid ‘Wash’ the Sleeping Brain in Rhythmic, Pulsing Waves

During sleep, waves of oxygenated blood (red) and then cerebrospinal fluid (blue) wash over the brain.(Image: © Laura Lewis])

This link is fascinating; it shows the brain being washed by the spinal fluid in rhythmic, pulsing waves. One of the many functions and sequencing that are being discovered. The first few paragraphs follow.
What happens to your brain as you sleep? A new video holds the answer: A juicy mix of blood and cerebrospinal fluid slosh through your smushy noggin in a rhythmic pulsating dance. 

The movement appears almost tidal in a video released Oct. 31 along with an article in the journal Science. Though researchers knew that brain activity takes on a rhythmic pattern during sleep, this video and study mark the first time anyone has observed a similarly rhythmic flow of cerebrospinal fluid. 

“We’ve known for a while that there are these electrical waves of activity in the neurons,” study co-author Laura Lewis, a professor of biomedical engineering at Boston University, said in a statement. “But before now, we didn’t realize that there are actually waves in the CSF, too.”
By Stephanie Pappas – Live Science Contributor November 13,