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 the hormone that is most commonly associated with the sleep-wake cycle. Levels of melatonin vary throughout the day (and night) which helps regulate circadian rhythms in the body. [14] Melatonin levels are high at night (during sleep) and low during the day (during wakefulness). The levels of melatonin are regulated by the suprachiasmatic nucleus of the hypothalamus which reacts to the amount of light in the environment. So the darker it is outside of the body the more melatonin there is. [15]