I have been watching my routing since long back, from my school days to my office life. All I can say that everything in this universe is for a cause. All the human being helps each other. If one fails, everyone fails at somewhere in life.
Thus, when I wake up, I must breathe fresh air. The sunlight gives you a visit at your front door every day. A house should be constructed in such a way. However, when the bird starts chirping, that's the natural alarm that you should wake up.
As soon as the soft sunlight flashes into your eyes, dependably you should have it at least for fifteen minutes, that is the minimum requirement of our body.