I found this while searching for something else, on Google and thought you might find it interesting.
From the Peoria Humane Society website: Melatonin the Marvelous!!!
Amazingly, an effective treatment for thunderstorm and noise phobias may be an over-the-counter hormone used by humans to prevent insomnia. Melatonin, which is produced by the pineal gland, sets the body’s internal clock in response to exposure to light. The body creates melatonin only in total darkness …