ABSTRACT
Melatonin is a small amphiphilic indolamine secreted from the pineal gland principally at night. The hormone is involved in sleep regulation as well as in a number of other cyclical bodily activities and circadian rhythm in humans [1]. The concentration of melatonin in the blood of an organism is high at night, as the produced amounts of melatonin are massive during that time and are released into the circulatory system, setting the body ready for slumber. When the night is about to become daytime, blood melatonin levels are reduced.
