The pineal gland is a part of the endocrine gland. The third eye as referred by secret societies. One of pineal gland's importance is that it produces melatonin. Melatonin is a body hormone which is secreted by the pineal gland which aids in the rhythmic function of our body to follow sleep. Melatonin serves as an aid from sleep deprivation and for the relaxation of our body. Another one is the serotonin which is responsible to gives us deep and relaxed sleep at night.