* Lengthens time in deep sleep * Non-habit forming, no groggy side-effects * Sleep * Dietary Supplement * Vegetarian Reset Your Internal Sleep Clock! Restful Zzz"s Restorative Sleep Aid contains high-potency valerian extract, clinically shown to improve sleep quality. In fact, valerian helps improve the length of time in the most important deep-sleep stage. When taken for several weeks, Restful Zzz"s helps the body naturally adjust to falling asleep on a regular schedule and stay asleep. Take the first step to healthy sleep—say "Good Night" with Restful Zzz"s! This formula was developed in accordance with the safety and efficacy standards set forth by the German Commission E, which is the worldwide recognized authority for effective herbal remedies.