Amyloid plaques (IMAGE) RMIT University Caption The study showed the severity of sleep apnea was linked with a corresponding build-up of amyloid plaques (seen here as brown patches in the brain tissue). Credit RMIT University Usage Restrictions Credit RMIT University License Licensed content 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.