Is Ferritin Eisenmangel useful for sleep?

Ferritin is an iron storage protein. Low ferritin (iron deficiency) can indirectly affect sleep, especially through Restless Legs Syndrome (RLS), which is linked to iron deficiency. Evidence shows that iron supplementation in deficient individuals can improve RLS symptoms and sleep quality. However, ferritin is not a direct sleep marker – many other factors like stress, hormones, or sleep apnea are involved. The evidence is human-moderate: there are RCTs on iron and RLS, but no strong evidence for general sleep improvement in people without iron deficiency. A ferritin test can be useful if sleep disturbances are accompanied by RLS symptoms (urge to move, tingling in legs). Caveat: a normal ferritin level does not rule out other sleep causes; persistent sleep issues require medical evaluation. MyBody-X offers ferritin as a biomarker, but interpretation should always be in a clinical context.