A novel approach involving fecal microbiota transplants (FMT), commonly referred to as "poop pills," has shown potential in improving chronic insomnia, according to new research from China.
The study, published in the Journal of Internal Medicine, investigated the link between the gut microbiome and sleep quality. Eighty adults diagnosed with long-term insomnia participated in the trial.
Participants were divided into two groups. The experimental group received two days of antibiotics to reduce existing gut bacteria, followed by 60 FMT capsules containing beneficial bacteria from healthy donors who were good sleepers. A booster dose of 20 capsules was administered two weeks later. The control group received placebo pills.
Sleep Efficiency Improvements
Researchers utilized polysomnography, an overnight sleep assessment that monitors brain waves, eye movements, heart rate, oxygen levels, and breathing patterns, to measure sleep quality. The results indicated a significant increase in sleep efficiency—the percentage of time spent asleep while in bed—for the FMT group. Their sleep efficiency rose from 79% before the treatment to 93% one month after the transplant.
In contrast, the placebo group experienced a minimal increase in sleep efficiency, moving from approximately 85% to 87%.
Reduced Nighttime Awakenings
The study also tracked the time participants spent awake after initially falling asleep. The FMT group showed a marked improvement, with this time decreasing from 79 minutes to 17 minutes. Conversely, the placebo group saw an increase in nighttime awakenings, with time spent awake after falling asleep rising from 37 to 42 minutes.
Furthermore, participants in the FMT group reported sustained sleep improvements for up to six months after the treatment concluded.
Gut-Brain Connection and Future Research
While the findings are encouraging, the study had limitations, including a small sample size and measuring sleep only once after one month. The use of antibiotics alongside FMT also complicates the attribution of improved sleep solely to the fecal transplant.
However, the research aligns with a growing body of evidence suggesting a connection between gut bacteria and sleep regulation. Experts note that gut microbes can produce chemicals that travel to the brain, influencing stress responses, inflammation, and the body's sleep-wake cycle. Conversely, disrupted sleep can also alter the gut microbiome, raising questions about the direction of this influence.
Additional research is needed to fully elucidate the biological mechanisms behind these sleep improvements, but the current findings position FMT as an experimental avenue for addressing insomnia.