Valerian is a plant native to North America and Europe. Valerian is used for treating sleep disturbances. Clinical studies have shown that valerian shortens the time it takes to fall asleep and also improves the quality of sleep. Unlike prescription drugs used for treating insomnia, the use of valerian does not lead to physical dependence or addictions. In addition it does not produce the "hangover" feeling as observed when using prescription drugs. Valerian is "generally recognized as safe" by the U.S. FDA.