Evidence check: Mikrobiom Test in the context of Schlaf

The question of whether a microbiome test is useful for sleep issues requires a cautious, evidence-based answer. There is emerging research suggesting that the gut microbiota can influence sleep via the gut–brain axis—for example through serotonin precursors or short-chain fatty acids that affect circadian rhythms. However, the evidence for direct, clinically meaningful effects in humans remains weak and inconsistent. Most commercial microbiome tests (including MyBody-X) analyze stool bacterial composition but cannot diagnose sleep disorders or provide causal explanations. Results are highly variable, influenced by diet, medications, and lifestyle, and change over time. At best, such a test might reveal low diversity or specific imbalances, but these are not validated as actionable targets for sleep improvement. Current sleep medicine relies on sleep diaries, actigraphy, and clinical evaluation. Marketing claims linking microbiome tests to better sleep often overstate the science. In summary, the evidence is insufficient to recommend a microbiome test for sleep management at this point.