Valerian Sometimes described as nature’s tranquilliser, valerian grows wild in North America and Europe and it is also cultivated for medicinal purposes. Valerian has been taken for centuries to treat nervous anxiety, reduce muscle tension and relieve mild insomnia. On its own or as an ingredient in herbal sleep remedies, valerian can help manage insomnia and improve sleep quality. It is especially valued for its lack of side effects compared to more conventional sleep remedies. It can be found in NiteHerb and Bonuit (in combination with Passionflower, used to relieve mild anxiety).