sleep evolved before brains

[scruffy]

Hydras sleep.

They don't have a nervous system.

Sleep Evolved Before Brains. Hydras Are Living Proof. | Quanta Magazine

Studies of sleep are usually neurological. But some of nature’s simplest animals suggest that sleep evolved for metabolic reasons, long before brains even existed.

www.quantamagazine.org

 

[luiza]

This was recently confirmed by White House research .

All seemed permanently asleep and there was no evidence of a brain .
QED