For a good sleep your room should be as dark as possible (remember we are descended from cavemen and it was really dark in there!)
This is why you need the Good Sleep Clock.

Not only can you adjust all of the sizes to reduce the number of illuminated pixels on the screen AND the colour of the clock face itself to maintain night vision BUT you can also dim the screen's backlight right from within the application. All of your settings restored next time you start the Good Sleep Clock.

Notes:
The Good Sleep Clock is intended to be docked during use to avoid battery drain overnight.
The Good Sleep Clock does not have an alarm feature. This is intentional as we believe that using Apple's alarm is the most reliable way to ensure you will wake up from your good night sleep as it does not need to run in the foreground.