You might think good sleep happens in your brain, but restorative sleep actually begins much lower in the body: in the gut.

The community of trillions of microbes living in your digestive tract , known as the gut microbiome, plays a powerful role in regulating sleep quality, mood, and overall well-being.

When the gut microbiome is balanced and healthy, sleep tends to follow . When it is disrupted, insomnia, restless nights, and poor sleep cycles often appear .

Gut and brain communicate constantly through the gut-brain axis . This communication network involves nerves , hormones , and immune signals .

The best-known part of this system is the vagus nerve , which acts like a two-way communication line carrying information between the gut and the brain. Researchers are s

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