In "Ender's Game," the protagonist Ender Wiggin experiences intense battles and strategic training that blur the lines between his waking life and dreams. His nights are filled with vivid, challenging simulations that push him to his limits, making the mundane reality of daytime feel surreal and unimportant in comparison. This immersive training environment captivates him, leading to a growing sense of disconnection from the world outside the battle simulations.

The phrase "nights were so real that days began to seem dreamlike" captures Ender's struggle to distinguish between his rigorous training and actual life. As he confronts complex moral dilemmas and the emotional weight of his responsibilities, the intense pressure of his nightly experiences impacts his perception of reality. Ender's journey reflects broader themes of growth, isolation, and the exhausting nature of leadership in a high-stakes environment.