Have you ever woken up after a four-hour sleep, fresh as a new leaf? Have you ever woken up from a ten-hour slumber, more tired than you were before you went to bed? I don't know why it happens, but there seems to be no relation between amount of sleep and how fresh we feel when we get up. Some days you get up enthused and some days you are half alseep even after having enough sleep and a good work-out.

I have often wondered what are the factors that influence quality of sleep. Is it the posture? Is it our breathing pattern? Is it the room temperature? Is it the amount of fresh air in the room? Is it the thoughts that we have just before we fall asleep - how relaxed or distured we were when we fell asleep? What is it that leads to refreshing sleep? I need to know it. As I rarely get eight hours of sleep everyday, I need to know how to compensate quantity by good quality. I need to experiment and find out answers to these questions.