Myths vs facts: HLA-DQ2 and sleep

The claim that HLA-DQ2 directly affects sleep is a myth. HLA-DQ2 is a genetic risk factor for celiac disease, an autoimmune condition triggered by gluten. There is no robust evidence that the gene itself – independent of active celiac disease or gluten exposure – regulates sleep-wake cycles or sleep quality. Sleep disturbances can occur in untreated celiac disease, often due to nocturnal abdominal pain, nutrient deficiencies (e.g., iron, vitamin D), or systemic inflammation. However, these are consequences of the disease, not the genotype. Many individuals carrying HLA-DQ2 never develop celiac disease and have no sleep-related symptoms. Direct-to-consumer tests that market HLA-DQ2 as a 'sleep gene' overstate the science. The fact is: a positive HLA-DQ2 result alone tells you nothing about your sleep health. If you have sleep issues, focus on common causes like stress, sleep hygiene, and medical conditions. Celiac screening is only warranted if you have symptoms or risk factors.