During Sleep, the Brain Exhibits Large-Scale Waves (video) Boston University Share Print E-Mail Loading video... Caption During sleep, the brain exhibits large-scale waves: waves of blood oxygenation (red) are followed by waves of cerebrospinal fluid (blue), as reported in Fultz et al., Science, 2019. Credit Copyright by Laura Lewis, Boston University. Usage Restrictions Copyright must be attributed to Laura Lewis, Boston University. 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.