Is Ferritin useful for Schlaf?

Ferritin, a key iron storage protein, is commonly measured in blood tests. Low ferritin levels indicate iron deficiency, which is linked to sleep disturbances, particularly Restless Legs Syndrome (RLS). Evidence supports that iron supplementation in deficient individuals can improve RLS symptoms and sleep quality (PMID: 29065410). However, ferritin is not a direct sleep biomarker. For people without iron deficiency, ferritin testing adds little value for sleep assessment. Elevated ferritin may signal inflammation or hemochromatosis, posing health risks. Thus, ferritin is useful for sleep only when iron deficiency is suspected or present. In consumer health tests, ferritin should be interpreted with caution and not used alone to guide sleep interventions. The evidence is moderate for RLS but unclear for general sleep improvement. A comprehensive evaluation including clinical history and other iron markers is recommended.