Myths vs facts: hsCRP and sleep

There is an association between sleep quality and hsCRP (high-sensitivity C-reactive protein), a marker of inflammation. Studies show that chronic poor sleep (e.g., <6 hours or fragmented sleep) is linked to elevated hsCRP levels. However, this is a correlation, not causation: poor sleep may promote inflammation, and existing inflammation can disrupt sleep. A single hsCRP value does not diagnose sleep disorders—it is influenced by many factors (infections, smoking, obesity, stress). Myths include that hsCRP alone proves sleep problems or that supplements lowering hsCRP will improve sleep—these are not well-supported. The evidence is mostly observational; randomized controlled trials are limited. For individual assessment, hsCRP should be interpreted alongside other inflammatory and sleep metrics. Consumer tests (e.g., MyBody-X) provide a number but not a diagnosis. If hsCRP is elevated and sleep issues persist, medical evaluation is warranted.