I guess the beauty of research is there is almost always something that has been written to support most all claims. It is important to explore more than one source, imo.

Melatonin isn't a silver bullet but there is evidence that supports it as likely safe and effective for some people with disordered sleeping

http://jp.physoc.org/content/561/1/339.full
http://www.gwern.net/docs/2005-brzezinski.pdf
http://onlinelibrary.wiley.com/doi/1...7.00613.x/full