I read that before I got into working in the neurotech/sleeptech space.
The Cambridge textbook The Neuroscience of Sleep and Dreams[1] I found surprisingly approachable. I've long had an interest in neuroscience, so it wasn't a completely new subject to me, but it wasn't a bad read.
I'm a life-long insomniac, you didn't go into the details of your sleep problems, and I initially read Why We Sleep because I was trying to understand sleep and fix my own problem. Unfortunately, I it's still all the same CBT-I stuff, sleep hygiene, etc etc.
We're not working in insomnia, I haven't found anything in the peer-reviewed literature which is convincing that anyone is near a solution in this space.
[1](https://www.cambridge.org/core/books/neuroscience-of-sleep-a...)