I think you've got what @jmkni said mixed up with the common saying "read this book if you have trouble sleeping at night" -- which means exactly as you said.

I think you've got what @jmkni said mixed up with the common saying "read this book if you have trouble sleeping at night" -- which means exactly as you said. "If you have trouble staying awake" would be the opposite, and I'd take it to mean the book is positively terrifying.