Most books about sleep give you the same old advice: Create a bedtime ritual, avoid screens, cut down on coffee, bla bla bla. If that's the book you're looking for, keep browsing the store.
Set it & Forget it
teaches you something new. Read it and you will understand why sleep hygiene is a trap, why giving up anything in the pursuit of getting more sleep is a bad idea and why nothing you tried has worked. Most importantly it will teach you what you should do:
Much less than you think.
Understand why you haven't slept well, let go of habits that have gotten you stuck and restful sleep will come your way.