Not sure if anyone's done this before, but I'm thinking about this coffee in a can that helps you if you need to stay awake. When a person drinks it, they're able to stay completely awake for the week without side-effects. However, the next week they will be hit with extreme drowsiness. The only cure for this is either drinking more of this "miracle coffee" or sleeping. The people who are hit with this drowsiness feel an extreme fear of falling asleep, and will desperately try and find more of the miracle coffee. If they fall asleep, they either enter a permanent coma or die instantaneously.
Thoughts? Ideas?