Valerian is a strong medicinal herb for the central nervous system. It is good as a sedative for insomnia, helps with sudden emotional distress, headaches, intestinal cramps, nervous exhaustion, and as a pain reliever.
Since you use the root of Valerian for medicinal purposes, you do not make an infusion tea with it, but rather a decoction.
To make a Valerian decoction, place 1-3 tsp. of the dried root in a small saucepan and over with cold water. Heat slowly and simmer, covered, for 20-45 minutes. The longer you simmer the herbs, the stronger the tea will be.
Another option is that you can crush 1 tsp. of the dried root and soak it in cold water for 12-24 hours. Then drink.