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.
It is used for many reasons and the ones most often sited are: 1  Insomnia in older adults. 2  Jet lag. 3  Sleep improvements.  Problems falling 1  asleep. Problems not sleeping long enough.  Blindness (amount of melatonin we produce is determined by how dark or light our surroundings 1  are) Sleep problems in children with special  needs.