I was instantly fascinated by the world building. The characters, particularly the young prime cadets, are definitely one of the strong points of the story. The battle simulations were an exhilarating read and I can't wait to join Aidan and his friends in their quest to find out the truth about their past.
If you liked 'Ready Player One' by Ernest Cline and Veronica Roth's 'The Divergent Series', you should give 'I am Sleepless' a go. Honestly, I was on the edge of my seat throughout the whole book. I cannot wait for the next one to be out.