Melatonin, a natural substance produced by the pineal gland which aids in regulating the body's "biological clock," has shown to be effective for people who suffer from insomnia.
In a three-week study, nine people, aged 68 to 80, took two milligrams of melatonin per day. At the end of the study, the subjects reported it had taken them less time to fall asleep, they had slept longer, and they felt more refreshed after sleeping. In other words, they slept better.
If melatonin is proven to be safe and is scientifically substantiated, it will serve as a natural alternative for insomnia sufferers.