1) The picture.
2) Pistachio factoids: Pistachios contain about 660 nanograms melatonin per gram of pistachio, which was more than various other foods. Melatonin is a hormone produced by the pineal gland to regulate the body's internal biological clock and control daily sleep cycles.
3) Article link:
https://www.prnewswire.com/news-rele...sleep%20cycles.