Both fish and humans have REM-like sleep - Science News

1. Both fish and humans have REM-like sleep  Science News
2. Slumbering zebrafish may offer clues to the origins of sleep  National Geographic
3. Neural sleep patterns emerged at least 450 million years ago, researchers find  Phys.org
4. Sleeping fish may help us understand why we snooze  Boing Boing
5. Sleep As Humans Experience It May Have Emerged 450 Million Years Ago  Newsweek
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