What role does Ferritin Eisenmangel play in Schlaf?

Ferritin, the main iron storage protein, is a key biomarker of body iron status. Iron deficiency (low ferritin) can affect sleep through several mechanisms: First, iron is required for dopamine and serotonin synthesis, which regulate sleep-wake cycles and melatonin production. Second, low ferritin (<50 µg/L) is strongly linked to Restless Legs Syndrome (RLS), causing difficulty falling asleep and fragmented sleep. Third, iron deficiency can reduce hemoglobin and oxygen transport, leading to fatigue and daytime sleepiness that indirectly disrupts sleep. The evidence is mostly mechanistic and epidemiological; randomized trials on ferritin-guided supplementation for sleep disorders are limited. Importantly, ferritin is an acute-phase reactant—inflammation can falsely elevate levels. Thus, ferritin should be interpreted together with CRP and transferrin saturation. The provided context does not contain specific studies on ferritin and sleep, so this answer is based on general medical knowledge.