Melotonin is naturally produced within the body by the pineal gland, which is a small pea sized gland in the center of the brain. At night, melatonin is produced to help our bodies regulate our sleep and wake cycles. As we get older, the amount of melatonin produced by our body reduces which has led scientists to believe that this may be the reason why younger people have less of a problem sleeping than older people do.

Narcolepsy is one of the most unusual and least common of all sleep disorders. Narcolepsy is both a medical condition and a sleep disorder that causes chronic and uncontrollable instances of daytime sleepiness. A person with narcolepsy can experience the sudden onset of sleepiness and fall asleep at a moment's notice no matter where they are or what they are doing. They may drop whatever they happen to be holding, become limp, and fall to the floor in sleep.