Sometimes, it's nice to have a light on as you get ready for sleep, but having it at full brightness is no good. Make shows how to build a self-dimming lamp with a built-in sleep timer.
The idea here is pretty simple: turn the light on and over time it starts dimming at a set rate. Building this for yourself will take a bit of work, but the end result is a unique little light that you can customise to work however you want.
LED Lamp with Sleep Timer [Make]