Alarm Clocks

How come when ever you sleep in too late, you wake up right when you need to be somewhere? It always happens the same way: you wake up, you look at the clock and realize your class starts in five minutes, or the bus is pulling away from the bus stop at that very moment! So yesterday, I was supposed to catch the 7:09 bus to Davis High School. I slept through my alarm at 6:30, woke up, looked at the clock...7:09. Sometimes alarm clocks just fail.