Sleep: Much More Than You Wanted to Know (in a good way): https://www.goodreads.com/book/show/34466963-why-we-sleep https://www.goodreads.com/book/show/34466963

Sleep: Much More Than You Wanted to Know (in a good way): https://www.goodreads.com/book/show/34466963-why-we-sleep https://www.goodreads.com/book/show/34466963-why-we-sleep That Sleep book by Matthew Walker has a good explanation of how sleep-related hormones (including melatonin) and such work -- and how to get better and longer sleep. More seriously though, the melatonin article was useful to me as we decided we were using melatonin incorrectly with our dog to reduce early morning barking (too high a dose even though it was what it the bottle advised, too early) -- and so we stopped giving it to her entirely.