Four stars:
Nightmare Obscura: A Dream Engineer's Guide Through the Sleeping Mind by Michelle Carr (2025) is a summary of the current state of dream and nightmare research. The book is divided up into easy read chapters the cover things like what is sleep, insomnia, how do we dream, what are common themes, when are bad dreams nightmares, various approaches to mitigate nightmares, and lucid dreaming.
https://pussreboots.com/blog/2026/comments_03/nightmare_obscura.html