David Myers

Why Do We Sleep?

Blog Post created by David Myers Expert on Jul 19, 2016

Originally posted on May 12, 2014.


Sleep consumes time we could spend foraging and it exposes us to predators.  It’s a waste and a risk.  So why do humans sleep?  Why didn’t nature design us for continual activity and vigilance?

In the October 18, 2013 Science, researchers offer an answer:  sleep enables house cleaning.  Studies of mice show that sleep sweeps the brain of toxic metabolic waste products.

Ergo, at the day’s end we can say to our loved ones:  Good night.  Sleep tidy.