When you absolutely, positively have to get up on time, set the Danger Bomb Clock Alarm and nod off peacefully, knowing that you can't possibly sleep through this one. When you hear the explosion, it's time to get up. There's no snooze button, and to turn off the alarm you must exit your warm bed and figure out one of the three randomly assigned codes. Alternatively, you can turn it off by running over it in your car.
Link - via trustypony
Fortunately the Cuba option will be closing in the not too distant future.