Sacred Haven of Debauchery

To wake up from an alarm clock, you simply need to go to bed on time and get a good night's sleep; otherwise, it's all pointless.

I can go to sleep whenever I want, and then either toss and turn for ages and not be able to sleep (even if I try very hard to fall asleep), or pass out after a few minutes. And this is despite the fact that I need to get up early every day.
The only way to wake me up is to set an alarm with three 5-minute intervals, with the last interval going off exactly when I need to get up. Sometimes I use 4-5 intervals instead, but only if, after waking up, I know I can afford an extra 10 minutes in bed. If something important and urgent is happening, I get up at the first alarm. However, on those days, I don't sleep much anyway.