This finding supports a groundbreaking view that sleep arises from the interplay between the brain and the microbiome — a partnership that could reshape how we understand consciousness, evolution, and health. The work opens a new frontier in sleep science, suggesting that the key to our rest may lie as much in our gut as in our heads.

What Drives Sleep? A New Look at the Gut-Brain Connection
What causes us to sleep? The answer may lie not only in the brain itself, but also in how it interacts with the microorganisms that develop in the gut.

New research from Washington State University points to a shift in how scientists think about sleep. The study found that peptidoglycan, a material that forms part of bacterial cell walls, appears naturally in the brains of mice and aligns closely with their sleep patterns.

These results build on a long-running scientific idea at WSU that suggests sleep may emerge from communication between the body’s systems that regulate rest and the large community of microbes that live inside us.