How are tTG IgA and sleep related?

The relationship between tTG IgA (tissue transglutaminase IgA) and sleep is not directly addressed in the provided knowledge context. tTG IgA is a well-established biomarker for celiac disease, an autoimmune condition triggered by gluten. Untreated celiac disease can lead to sleep disturbances due to symptoms like abdominal pain, diarrhea, nutrient deficiencies (e.g., iron, vitamin D, B vitamins), or associated conditions such as fatigue and restless legs syndrome. However, there is no strong evidence for a direct, independent effect of tTG IgA levels on sleep quality. The evidence is best classified as 'unclear' or at most 'mechanistic'. An elevated tTG IgA alone does not predict sleep problems; it indicates possible celiac disease, which may indirectly affect sleep. Consumer DNA or lab tests measuring tTG IgA should not be used for sleep assessment. For sleep issues with suspected celiac disease, medical evaluation including duodenal biopsy and a gluten-free diet is the gold standard. The provided context contains no specific studies or PMIDs on this topic.