We can see that people spend 8 hours a day for sleep and nearly 1/3 of his life to sleep. That shows the importance of its essential. For children sleep help for well-being, for older people sleep is the time to regain health. So, we need to focus on his sleep. Sleep is a vital need for our body.sleep plays an important role in immune function, metabolism, memory, learning, and other important functions.
đang được dịch, vui lòng đợi..
