Is MC4R useful for sleep?

The provided context does not contain any direct information linking MC4R to sleep. MC4R is primarily known for its role in energy homeostasis and appetite regulation; some research suggests indirect connections to sleep via metabolic pathways, but the evidence is weak and not clinically actionable. Without specific studies in the given knowledge base, the utility of MC4R for sleep assessment remains unclear. Consumers should rely on proven sleep hygiene and medical advice rather than single-gene tests. Evidence grade: unclear.