Accessible from the Lock Screen and Notification Center, Luna lets you enable Do Not Disturb in a more efficient and seamless way. Simply start pulling down from the top of the screen to reveal a crescent form, then release!
Luna also extends the functionality of Do Not Disturb to more than just the lock screen. When unlocked, notifications will arrive in the form of non-obtrusive Nocturnal Banners.
You can purchase Luna from the Cydia Store for $1.99.