Passion flower (Passiflora incarnata) has a long tradition of use in herbal medicine. Many users report calming effects without the sedation typical with other aids.
It is especially popular in Europe as a sleep and anxiety aid, often combined with Valerian.
Studies suggest that Passion flower is comparable to anxiety medications in treating anxiety symptoms. This is thought to be because both Passion flower and anxiety drugs both work by increasing GABA in the brain.