A growing body of research suggests that gut health plays a significant role in sleep quality, with imbalances in gut bacteria linked to issues like insomnia and restless sleep. A 2022 review in Sleep Medicine Reviews highlights the gut-brain connection and supports the use of prebiotics as a promising strategy.

October 2025 -- Emerging research shows that your gut may play a bigger role in your sleep than previously thought — and nourishing your microbiome could be the missing piece in improving sleep quality.

A 2022 review published in Sleep Medicine Reviews has highlighted a growing body of evidence linking the gut microbiota to sleep regulation. Researchers describe a two-way relationship between sleep and gut health: poor sleep disrupts the balance of gut bacteria, and gut imbalances may, in turn, worsen sleep disturbances.

The study details how the microbiota-gut-brain axis — the communication pathway between the gut and the brain — influences sleep through metabolic, immune, and neural signalling. Sleep disorders such as insomnia, fragmented sleep, and sleep-related mood issues are increasingly being associated with changes in gut bacterial composition.

The review also suggests that targeted gut interventions may offer a new path for managing sleep problems. One approach is through the use of prebiotics — specific types of fibre that feed beneficial bacteria in the gut and support microbial balance.

One such prebiotic, PHGG (Partially Hydrolysed Guar Gum), is gaining attention for its gentle effect on the digestive system and its ability to increase populations of short-chain fatty acid-producing bacteria. These by-products have been linked to reduced inflammation and improved nervous system function, both of which play a role in sleep health.

PHGG is a tasteless, water-soluble dietary fibre made from the guar bean. It dissolves easily into water or smoothies and is well-tolerated, even by people with sensitive digestion. Unlike many harsh laxatives or fibre supplements that can cause bloating or discomfort, PHGG works gently to support regularity while feeding the beneficial bacteria in the gut. To ensure safety and purity, PHGG from reputable suppliers is also independently tested for glyphosate, a common agricultural chemical that has raised health concerns in recent years.

As the gut-sleep connection continues to be explored, nourishing the microbiome with prebiotic fibres may become a foundational strategy for people struggling with sleep — offering a natural, food-based tool for better rest.

Wonder Foods offers this information for educational purposes only. Please consult your healthcare practitioner for personalised advice.