This follows the same belief as the long-lived in Japan. During one's older year, the jing qi is generally weakened and depleted. Zang fu function is not as energetic and strong as in youth. It is, therefore, of utmost importance to avoid hard labor and to pay attention to resting and fostering the needs of the body. To get sufficient sleep is also very important.
Good sleep helps our shen reside within the body unperturbed by the outside world.
Thus it is a well accepted theory among people that the key to longevity is the ability to eat and sleep well. In everyday life, we often encounter people in poor health due to insomnia and they are invariably fatigued and their memory is poor. When this happens in the elderly, it speeds up the aging process. Thus a good balance between physical labor and mental activity is recommended. It is a proven fact that enjoying pleasant music can increase both one's physical and emotional strength.