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Quite a bit ago in a solar system some distance from here, the Millennial Eagle soared through Hyperspace. The crew had just left somewhere exciting and dangerous to go somewhere else considerably more exciting and dangerous. In the meantime, with the screensaver-like stars whooshing past, half the crew decided to get some shut-eye. The deep rumble of the ship's engines put them right to sleep, and they dreamed of daring heroics and complicated family relationships. The other half of the crew decided to re-organize all of their contraband, and the deep rumble of the ship's engines helped them get super concentrated as they counted up their fortunes while ignoring thoughts of impending doom.
No matter what galaxy you live in, Hyperdrive engines MP3 sounds will help you sleep or focus. It's a known fact.