Insomnia is one of the creepiest books I've read in a while and I can say I thoroughly enjoyed it! 
 This book rides high on tension and suspense as Parker becomes more and more desperate to find a cure for his insomnia and the demons playing in his head. His decisions are rash and he does things with the sole purpose of finding some form of peace to calm the chaos in his mind. There were several times I cringed from what he was doing because you know what he's doing is often crossing a line but you can't help but understand because of the desperation oozing from his narration. You can't help but feel his exhaustion and how tightly he's clinging to anything to keep him sane. All of these elements had me reading quickly, dying to know what happens next. 
 A couple of other things I really enjoyed: Parker and his friends are a great group of characters; romance takes a backseat but there is one present, slow burning and sweet, and thankfully not with the most obvious character. 
 I had many questions as I read and although many of them aren't answered, there's the promise of more explanations in the next book, which I can't wait to read. Overall, a great debut and a deliciously creepy read.