The Digital Hourglass, designed by students Susann Hamann and Fabian Hemmert at Germany's Potsdam University of Applied Sciences, is set by tilting it at a 45-degree angle, with each LED representing one hour. Therefore, when you wake up in the middle of the night, you can glance over and easily determine how many "dots" of sleep you have left. Snooze is a key feature only requiring a simple 180-degree flip for five more minutes of bliss. Sadly just a prototype for now, but the two designers thoughtfully documented the whole project, so you may be able to cobble together your own.