The bottom of your feet are powerful and direct access points to internal organs in your body through what is known as meridians in Chinese medicine. These meridians are pathways to each organ with your body. Some people say that meridians do not exist within the body or at the bottom of the feet. For those that understand Chinese medicine you may know that the meridian system is very closely correlated with the nervous system.
If you believe you have nerves and a nervous system, you believe you have meridians too, it’s basically the same thing when you interpret it and look at where the meridians are within the body. 
 
Here are the benefits of cutting up an onion and putting it in your sock (at the bottom) while you sleep…  

1. Purify your blood: Phosphoric acid from the onions as it’s applied and absorbed through trans-dermal means purifies the blood.
2. Kills bacteria, germs and pathogens: Onions (and garlic) have strong anti-bacterial and anti-viral benefits!
3. Purify the air: This little chamber of smelly onion around your feet will purify the air and keep your feet smelling better and free of toxins and chemicals pulling them out of your feet while you sleep.
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Sources: Patheos.com, Pinterest.