1, sleeping with the soles of the feet lying in the sun, has the miraculous effect of tonifying the kidney. If a person lacks sleep, or the quality of sleep is not good, he often suffers from listlessness, inattention, headache, dizziness, muscle aches and fatigue. If a person lacks sleep for a long time and is overworked, the body will produce pathological changes that consume gas and hurt blood and damage the five internal organs. Heart strain will damage blood, liver strain will damage spirit, spleen strain will damage food, lung strain will damage qi and kidney strain will damage essence, thus laying the groundwork for many diseases.

2. If you feel cold hands and feet and your back is cold, it means that it is caused by kidney yang deficiency, and the kidney is the innate foundation and the door of life. If the kidney-yang deficiency fails and the body's warming function declines, there will be symptoms of appeal. Taoism believes that the key to a person's life is to see whether the yang is sufficient. Therefore, sleeping with the soles of your feet on the ground is conducive to supplementing the yang.