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.
However, the administration of melatonin 5 mg for 3 weeks 2 to 3 hours prior to habitual bedtime decreased sleep onset (approximately 1.4 hours), slightly increased sleep duration (34 minutes), and improved sleep quality and daytime alertness.