Not books but hints. I use and recommend magnesium just before bed. "Magnesium: The Most Powerful Relaxation Mineral Available" https://www.huffpost.com/entry/m

Not books but hints. I use and recommend magnesium just before bed. "Magnesium: The Most Powerful Relaxation Mineral Available" https://www.huffpost.com/entry/magnesium-the-most-powerf_b_425499 https://www.huffpost.com/entry/magnesium-the-most-powerf_b_4... From 2017 "Israeli firm 2breathe has developed a smart sensor and complementary app to help those who have difficulty nodding off" https://geeknewscentral.com/?s=2breathe https://geeknewscentral.com/?s=2breathe