Both boys were moved from their beloved home:Bruno from his home in berlin when his father got a new position in Nazi regime as commandment of auchwitz, Shmuel from his home in poland when he was taken as a prisoner of war and put in a concentration camp.
Bruno lives wealthy and luxurious with maids and servants and shmuel lives in an overrun filthy barrak overseen by cruel and vicious gaurds
A; it mentions in the second sentence that he hadn't slept two consecutive hours due to dreams. He kept trying to get back to sleep near the end of the story, so that would be the main conflict.