From the Manufacturer:
Kava helps to relieve anxiety, without impairing mental function, and is also a safe muscle relaxant. Because of its relaxation invoking properties, Kava is an excellent herb for promoting restful sleep, unlike melatonin, which may cause disruptive dreaming. In Europe it is widely used as a mild sedative, and anti-anxiety medication as a safer alternative to prescription drugs such as Valium, Xanax, or Librium.