My one-line review of this - 'A flatline of a book.' 
 
WHY WHY WHY was this SO LONG?????
 
Every element that I enjoyed was completely overshadowed by the ridiculous, monotonous, useless length of this book. 
 
If in the ending loads of little threads that had been planted throughout the book came together, or even if, God forbid, there was enough plot to fill 800 pages I'd be completely content with such a long book. 
 
BuT tHeRe WaS ZERO rEaSoN for it to be SO long. 
 
Once you find out what's causing Ralph's insomnia there's zero mystery, intrigue or suspense to the story. It just goes on at the same pace and tone for hundreds more pages. 
 
The core ideas and fantasy elements of the book are really interesting at first, but they get boring as HELL after being repeated without much development for so many pages. 
 
There were some good portions of the story but they were so few and far between. For example, I was truly repulsed at some of the body horror sections, and the ending (which was relatively good for a Stephen King) was actually thrilling in places even though it was pretty predictable. But the action/fight scenes were so listless and had no energy to them, and so many other opportunities to be thrilling fell flat. 
 
When we actually meet them, the main villain of the book, who was one of the biggest mysteries throughout the entire story, was pretty pathetic and was dealt with so easily. So anticlimactic. 
 
I understand some of the book being lifeless as a stylistic choice due to the insomnia, but the whole book? Even when the characters felt energised?? Not great. 
 
Don't get me wrong, this book wasn't all awful, but each page was just more of the same thing/pace/stakes over and over and it got old. 
 
Also, as a petty side note, it was stated as fact that in LOTR Frodo was Bilbo's grandson????? CHECK YOUR FACTS.