Human Brain Structure. The human brain is comprised of a number of different regions. Each of these regions are vitally important with highly specialized functions. The central part of the brain includes the brain stem and the midbrain. The function of the midbrain and has been largely preserved over years of evolution.
Get over jet lag. When you travel, you can take melatonin to help with jet lag, which is daytime fatigue that occurs when changing time zones. The first night you arrive at your destination, you can take 0.5 to 5 mg of melatonin. Taking it can help you sleep and reset your sleeping patterns to match the new time zone you traveled to.
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.