It actually works because your sleep-lungs are in your feet. When your body changes to "sleep mode" and you start to breathe heavier, it's because you're using the lungs in your feet. The government are trying to cover up knowledge of these magical organs for fear that the public will start insisting on softer pavements and other, potentially very expensive, precautions to be taken to protect the foot lungs. Damn government. FUCK THE SYSTSEM! xx