Valerian root and passionflower are two popular herbal ingredients often used to promote relaxation and improve sleep quality. Valerian root is known for its calming effects and has been traditionally used to alleviate insomnia and anxiety by increasing levels of gamma-aminobutyric acid (GABA) in the brain. Passionflower, on the other hand, is recognized for its soothing properties, helping to ease restlessness and promote a sense of tranquility. Together, these herbs are commonly found in herbal sleep supplements, offering a natural approach to enhancing restful sleep and reducing stress.