Evidence check: VKORC1 in the context of sleep

The question about VKORC1 in the context of sleep is unusual, as VKORC1 (vitamin K epoxide reductase complex subunit 1) is primarily associated with the vitamin K-dependent coagulation cascade and warfarin dosing. None of the provided knowledge contexts mention any direct or indirect link between VKORC1 variants and sleep parameters such as duration, quality, circadian rhythm, or sleep disorders. Known SNPs (e.g., rs9923231) affect enzyme activity and anticoagulation, not sleep-related pathways. No published studies associate VKORC1 with sleep; the evidence is therefore 'unclear'. If a test markets VKORC1 for sleep advice, it is purely speculative and lacks scientific basis. Consumers should be cautious when genetic markers are used outside their established domain for lifestyle recommendations.