https://sleep.org/tag/melatonin/
http://www.blindcanadians.ca/participate/blog/2013/01/melatonin-can-mean-better-sleep-totally-blind
http://www.webmd.com/sleep-disorders/tc/jet-lag-and-melatonin-topic-overview
https://heartmdinstitute.com/heart-health/melatonin-and-blood-pressure/
https://www.ncbi.nlm.nih.gov/pubmed/22753734
http://www.mayoclinic.org/drugs-supplements/melatonin/evidence/hrb-20059770
http://www.livestrong.com/article/358100-melatonin-for-anxiety/
http://www.webmd.com/vitamins-supplements/ingredientmono-940-melatonin.aspx?activeingredientid=940