Is IgG Unverträglichkeitstest useful for sleep?

No, an IgG food sensitivity test is not useful for sleep issues. The scientific evidence is clear: IgG antibodies to foods are a normal immune response and do not indicate intolerance or allergy. Professional guidelines (EAACI, CSACI) explicitly reject such tests. Sleep problems can have many causes (stress, poor sleep hygiene, medical conditions), but an IgG test provides no actionable information. The claimed links between IgG reactions and sleep quality are not supported by clinical studies. Instead, persistent sleep issues should be evaluated by a physician, possibly with a sleep study, blood work, or hormone panel. This test is a marketing product, not evidence-based medicine.