Poppy seeds are a great source of iodine, zinc, copper, manganese magnesium.
Natural Products for Insomnia - WholesomeONE Natural Products & Approaches for Insomnia
How to Treat Insomnia Naturally ~ Seven Minerals https://www.sevenminerals.com/blogs/health-center/treat-insomnia-naturally
This interview with Rubin Naiman on treating insomnia naturally, looks at sleep, dreams, sleep medications, and the effects of modern lifestyle on sleeping.
YouBeauty discusses how to treat insomnia naturally.