Dawn simulation is a technique that involves timing lights in the bedroom to come on gradually, over a period of 30 minutes to 2 hours, before awakening.
http://en.wikipedia.org/wiki/Dawn_simulation

There are likewise apps for iphone/android:
http://appcrawlr.com/app/search?go=g...=ipad%2Ciphone

I was thinking it would be nice to have such an app for maemo, using the camera leds. Would anyone like to try this?