Well known for its soothing and calming effect, lavender and can be combined with other sedative herbs to relieve sleeplessness, irritability, headaches, and migraine. 
Lavender flowers are also known to be antibacterial and antiseptic. They calm the nerves, reduce muscle tension and relieve griping and wind.
Make an infusion using 1-2 tsp of the dried flowers in one cup of boiling water and allow to steep for 5-10 minutes. Sooths tension and help relieve insomnia, also a calming remedy for indigestion.
External use: inhalation: dried flowers in 2 to 3 cups of boiling water; inhale vapors for headache, depression, or insomnia. 
Topical application: lavender water can be safely applied. Pour 3/4 cups boiling water over 3 Tablespoons dried lavender flowers or buds. Let cool and strain. Can be sprinkled on your pillow for a good night's sleep, or applied to skin to cool, soothe and refresh. 
Lavender Bath and Oatmeal: place into a muslin bag or multiple thicknesses of cheesecloth, two tablespoons each of lavender buds or flowers, and freshly ground oatmeal (whirl in blender). Tie tightly with a long piece of string or ribbon. Attach the bag to the bathtub spigot, so the bag hangs below the water level. While bathing, rub the bag on the skin to soothe dry, itchy, achy spots. Very relaxing