Chimpanzees Build Beds in Trees for a Comfy Night's Rest (image) Duke University Share Print E-Mail Caption Our closest animal relatives, chimpanzees sleep an average of 11.5 hours a night, whereas humans snooze for just seven hours. Credit Photo courtesy of Kathelijne Koops, University of Zurich, Switzerland. Usage Restrictions None 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.