Pic: The moonset and sunrise calculator controls a "sky display," illustrating time in a way that young children can understand by using images of the sun, moon and stars. (Credit: Image courtesy of Carnegie Mellon)
"Science Daily — John Zimmerman, an associate professor in Carnegie Mellon University's School of Design and Human-Computer Interaction Institute, has developed an unconventional alarm clock every new parent needs — a clock to keep their children sleeping. Called the Reverse Alarm Clock, the product aims to keep young children from interrupting their parents' sleep. "
Complete with bedtime music, wake up music, and simple icons (moon, sun, stars) to let the child know when they should still be sleeping, when they can get up but not interrupt the adults, and when it's time to get up for the day.
As long as the child cooperates, this can be a simple, useful tool until they are old enough to recognize numbers.
http://www.sciencedaily.com/releases/2007/05/070514110501.htm
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