Dietary Supplement. Nature Science Knowledge™ Sleep is the most productive time for the body to rejuvenate, so getting quality sleep is essential. Lights Out™ is a blend of natural ingredients that promote healthy sleep cycles and assist in achieving the deep, restful sleep you need to wake up feeling alert, refreshed, and revitalized.* *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.