Nightmode cydia tweak it`s a configurable system-wide nightmode tweak.
Edit ID3 tags and import files into your iPod library with the help of the System-wide night mode for iOS. With iOS 7’s bright user interface, using your phone at night can be a hassle. Nightmode is the solution. Darken the user interface of applications and enjoy a greatly improved user experience.
A common list of applications that Nightmode supports:
There’s more to come! The next feature release will include options to further customise Nightmode!