What role does Ferritin Eisenmangel play in sleep?

Ferritin is the main iron storage protein. Low ferritin levels (iron deficiency) can affect sleep through several pathways. The strongest evidence links low ferritin to Restless Legs Syndrome (RLS), a neurological disorder characterized by uncomfortable sensations in the legs and an irresistible urge to move them during rest, especially at night. RLS severely disrupts sleep onset and maintenance. Clinical studies show that iron supplementation in RLS patients with low ferritin improves symptoms and sleep quality. Additionally, iron is a cofactor for dopamine synthesis, and dopamine dysfunction is implicated in RLS and sleep regulation. However, the direct effect of iron deficiency on sleep architecture in the absence of RLS is less clear. The provided context does not contain specific studies on ferritin and sleep, so this answer relies on established medical knowledge. Caveat: Low ferritin requires medical evaluation to rule out underlying causes like blood loss or inflammation. Self-supplementation with iron can be harmful (e.g., iron overload). Evidence grade: human-moderate (clinical association, but not from the given context).