| Pagerank history: | | 3 | current | | 1 | recorded at May 9, 2012 | | 3 | recorded at August 16, 2011 | | 4 | recorded at March 27, 2011 | | 3 | recorded at July 27, 2010 | | 3 | recorded at July 12, 2009 | | 3 | recorded at March 6, 2009 | | 4 | recorded at October 12, 2008 | | 4 | recorded at July 26, 2008 | | 4 | recorded at May 2, 2008 | | 4 | recorded at April 3, 2008 |
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| Description: | Melatonin is a hormone that is found in all forms of life on earth. In humans, it is produced by the pineal gland, a gland about the size of a pea, that is located in the center of the brain. The secretion of melatonin occurs during the night as a response to darkness, peaks in the middle of the night, and gradually falls during the second half of the night. The synthesis and release of melatonin is inhibited by light. For this reason melatonin has been called "the hormone of darkness." |
