Evidence check: Zöliakie Test in the context of Schlaf

The provided context documents contain no information on celiac disease testing or its relation to sleep. Celiac disease is diagnosed via IgA antibodies (tTG-IgA) and duodenal biopsy, not via single SNP DNA tests. Some studies examine sleep quality in celiac patients, but there is no clear evidence for a predictive genetic test. The given sources only cover BMI-associated variants (rs6265) and pharmacogenetics (CYP). Without specific data, an evidence-based statement is not possible. Evidence is therefore rated as 'unclear'.