I've long placed my alarm clock across the room so that I have to get out of bed to turn it off (with varying success, obviously). Hayat Benchenaa hanging alarm clock is a hanging ball suspended over your bed that lights and chimes to wake you up. To hit snooze, you just give it a little smack, causing the alarm to retract on its cord just a little nearer to the ceiling—forcing you to stretch more and more each time until you're eventually swiping at it with a broom, because you have 20-foot loft ceilings. For most people, though, the alarm will retract until it hits the ceiling, where it must be pulled down to its original length to reset.
Someone needs to put this into production—it's brilliant.