How are LCT and Schlaf related?

The relationship between LCT (lactase gene) and sleep is not well established in scientific literature. LCT determines lactase persistence and the ability to digest lactose. An indirect link might exist through diet: individuals with lactose intolerance (non-persistent LCT variants like rs4988235) often avoid dairy, potentially reducing intake of tryptophan (a melatonin precursor) and calcium, both of which are relevant for sleep regulation. However, no robust clinical trials directly demonstrate a causal effect of LCT variants on sleep quality or duration. The evidence level is 'mixed' or 'unclear'. Consumer DNA tests like MyBody-X can report LCT variants, but applying them to sleep is speculative. For sleep issues, established factors such as sleep hygiene, stress, and light exposure are far more influential. Consult a healthcare professional for personalized advice.