Sleep Evolved Before Brains. Hydras Are Living Proof.

Sleep Evolved Before Brains. Hydras Are Living Proof ...

https://www.quantamagazine.org › sleep-evolved-befor...

By Veronique Greenwood. May 18, 2021. Studies of sleep are usually neurological. But some of nature's simplest animals suggest that sleep evolved for metabolic reasons, long before brains even exi

creator evolved before creation