Fur Seal Sleeps on Land (IMAGE) Cell Press Caption This image shows a fur seal sleeping on land, where it experiences bilateral sleep like land mammals do, including alternating periods of non-REM and REM sleep. Credit Svetlana Artem'eva Usage Restrictions Credit Required 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.