Is APOA2 useful for sleep?

The provided context documents contain no information about the APOA2 gene or its relevance to sleep. APOA2 encodes apolipoprotein A-II, a component of HDL metabolism. Research primarily links APOA2 to lipid metabolism, satiety, and food intake, not sleep. Without direct evidence from the given sources, no conclusion can be drawn about the usefulness of APOA2 for sleep. Evidence: none. Caveat: consumer DNA tests for APOA2 may report weak, non-replicated associations; for sleep issues, established factors such as stress, cortisol, and lifestyle are more relevant.