Hmm this is tough to review. I love the concept and the worldbuilding. At times I had to put it down because the idea horrified me so much (as an insomniac myself, the idea of losing sleep completely terrifies me). 

It's a decent mystery story, but I kept finding myself more interested in the worldbuilding and the Sleeplessness issues rather than the direct plot.

I think the ending was exactly as it should be (going for realism lol). It's a good book, but I think I craved a character that felt more like a person and a conflict that was less politically heavy.