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To regulate the sleep cycle of the body, a hormone called melatonin is produced by human body. The level of this hormone is automatically decreased in the day time due to the exposure to light. The level of this hormone automatically increases in the dark and thus induces the sleep. This is a cyclic process.

Some people believe that melatonin is an anti-aging agent. This thought is developed because it is believed that the production of this hormone is decreased with the increase in age thus decreasing the need of sleep in older people.

This is a myth and there are no medical backgrounds that may support this hypothesis. Actually the level of melatonin does not decrease with the age and older people need the same sleep as the young people need.

The small doses of melatonin can be administered to increase the sleep in some persons. The normal dosage should not be more than 0.5 milligrams. Higher dose of melatonin can increase the concentration in the blood. There are various side effects noticed in the individuals who are taking melatonin. The common side effects are headache, nightmares, abnormal sleep cycles, drowsiness and depression. If you have previous history of depression problem then you must consult your physician before taking melatonin and also read melatnin supplement reviews online.