Sleep is the essential need of human body. It helps to relax, repair damage and facilitate metabolism in the body. As we know that about a third of human life is spent in sleep, whereas deep sleep accounts for only 25% of total sleep time. In view of this, a healthy sleep habit is one of the essential factors of high quality of life.

睡眠是人體內在的需要，它有助於放鬆，修復損傷和促進身體的新陳代謝。眾所周知，人類大約有三分之一的時間是在睡眠中度過的，而深度睡眠僅佔總睡眠時間的25％。因此，健康的睡眠習慣是提高生活品質的重要因素之一。