The Gut Problem Keeping You Up at Night

We’ve talked about the importance of your gut microbiome a lot recently.

Your gut has been linked to digestion, mood, weight, immunity—even heart and brain health.

And now, researchers believe it may play a role in another deeply personal struggle…

One that millions of Americans battle every night.

According to a groundbreaking new study published in General Psychiatry, certain species of gut bacteria may cause insomnia.

Researchers used a sophisticated genetic technique called Mendelian randomization to explore whether specific bacterial species are simply associated with insomnia—or if they actually trigger it.

And what they found was striking.

They identified 14 types of gut bacteria that may increase your risk of insomnia—and 8 types that may decrease it.

The study also found a potential feedback loop—where insomnia itself may further disturb gut bacteria balance. In other words, once poor sleep begins, it could set off a cycle that makes it harder to restore normal rest.

Could gut bugs really steal your sleep?

That’s the big question. The study’s authors say their analysis strengthens the case for causality—particularly for a bacterial strain called Clostridium innocuum.

In reverse testing, they also found that people with insomnia had up to a fourfold increase in 12 bacterial groups—and up to a 79% decrease in seven others.

That’s a major microbial shift… all tied to sleeplessness.

But not everyone is convinced.

Independent sleep experts praised the study’s methods but urged caution, noting that stress and environmental factors (like diet) can affect both gut health and sleep quality.

It’s possible, they say, that something else—like chronic stress—disrupts the gut and triggers insomnia simultaneously.

Still, one thing is clear…

Your gut microbiome and sleep patterns are deeply connected—and researchers are just beginning to understand how.

The idea that your gut health could impact your sleep is more than a fun fact. It could eventually change the way we treat insomnia.

Rather than relying on sleep medications—which often lose effectiveness over time or cause next-day drowsiness—future therapies may target your gut flora.

We’re not there yet.

But if you struggle with poor sleep and digestive issues, brain fog, or frequent illness, it may be worth taking a closer look at your microbiome.

Start with these natural strategies:

• Eat more fiber and fermented foods (like kefir, yogurt, kimchi, and sauerkraut)
• Limit artificial sweeteners and ultra-processed foods
• Consider a broad-spectrum probiotic
• Get regular sunlight and physical activity
• Manage stress through mindfulness or breathing techniques

Insomnia is a complex condition—but your gut might be an untapped key to better rest.

Your next good night’s sleep might just start in your gut,

Rachel Mace
Managing Editorial Director, e-Alert
with contributions from the research team

Sources:

Wendling, P. (2025, August 15). Specific Gut Bacteria Linked to Insomnia. Medscape. https://www.medscape.com/viewarticle/specific-gut-bacteria-linked-insomnia-2025a1000lno