Valerian has been used as a sleep aid for over 1,000 years. This herb is a native plant both of Europe and North America. Valerian roots are often prepared in tea form, and in doing so they should not be prepared with boiling water, as this may drive off the lighter oils. Its ability to help relax the central nervous system, promote feelings of calm, decrease levels of anxiety and stress, and enhance sleep are known to millions the world over. Unlike some prescription sleep aids, valerian is not known to cause morning grogginess and is non-addictive.