Brain Opens up the Pipes During Sleep (video) NIH/National Institute of Neurological Disorders and Stroke Share Print E-Mail Loading video... Caption Scientists watched dye flow through the glymphatic system, a brain "plumbing" system, of a mouse when it was asleep (left) and then, later, when it was awake (right). More dye flowed into the brain during sleep. Results from this study suggest the brain may flush out toxic molecules associated with neurodegenerative disorders during sleep. Credit Courtesy of Nedergaard Lab, University of Rochester Medical Center. Usage Restrictions Please use for educational purposes only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.