There is something oddly calming — despite the underlying menace — of this Death Star ambient audio, which lasts for no less than 12 hours:
This is the classic Death Star sound from Star Wars for 12 hours. Perfect for imagining that you are a Jedi working towards justice in deep space. Also great for meditating, relaxing, sleeping, or drowning out other annoying sounds.
Oh, and YouTube user crysknife007 has more where that came from. Check out the “Extended Star Wars Sounds” playlist.