Native Americans served in World War I even though they were not citizens of the United States. In fact, it was not until after World War II in the 1965 passage of the Voting Rights Act that all states were required to allow Native Americans to vote on the same basis as any other American.
Overview. Melatonin is a hormone secreted by the pineal gland in the brain. It helps regulate other hormones and maintains the body's circadian rhythm. The circadian rhythm is an internal 24-hour clock that plays a critical role in when we fall asleep and when we wake up. When it is dark, your body produces more melatonin.
Melatonin is meant to reset the body's internal clock -- for example, it's appropriate to use the supplement to counter the effects of jet lag, or help someone sleep if they have an unusual work schedule or suffer from a circadian rhythm disorder. It should not be used for general insomnia. The proper dosage, according to a seminal 2001 study from the Massachusetts Institute of Technology, is 0.3 milligrams. The research was conducted by Richard Wurtman, who pioneered the pharmaceutical use of melatonin as a sleep aid in 1994.