Air, water and food are must for a life, we know. But, many of us do not know that sleep is the fourth most essential for life giving sound body and mind. Loss of sleep, better known as insomnia, present in the third of the world's adult population leads to mental depression, a life threatening disease. An adult needs six to eight hours of uninterrupted profound sleep every day. How to ensure this? Let us understand the ways to deal with this issue point to point, and to get sound sleep.