The first lesson is just to breathe in a measured way, in and out. That will harmonise the system. When you have practiced this for some time, you will do well to join to it the repetition of some word as "Om," or any other sacred word. In India we use certain symbolical words instead of counting one, two, three, four. That is why I advise you to join the mental repetition of the "Om," or some other sacred word to the Pranayama. Let the word flow in and out with the breath, rhythmically, harmoniously, and you will find the whole body is becoming rhythmical. Then you will learn what rest is. Compared with it, sleep is not rest. Once this rest comes the most tired nerves will be calmed down, and you will find that you have never before really rested.