White noise. I bought a white noise machine years ago when I lived near a large emergency room that had ambulances going by all day every day. It really helped with the sirens, and when I moved away I kept using the machine. My brain now interprets the white noise as profound silence, and I sleep so deeply that I don’t know how I ever got by without it.
Hyperbole to emphasize the importance of following orders in battle, even if you think it’s a mistake.