Beginning meditators are often asked to count their breath, on the exhalation, up to ten. Then you begin back at one. If you lose track, simply go back to one. Your breath should be slow and regular, but not forced or artificially controlled. Just breathe naturally and count. A few weeks later, you may forego the counting and simply try to follow your breath. Concentrate on it entering you and exiting you. Best is to be aware as fully as possible of the entire process of breathing, but most people focus on one aspect or another: the sensation of coolness followed by warmth at the nostrils, or the rise and fall of the diaphragm. Many meditators suggest imagining the air entering and exiting a small hole an inch or two below your navel. Keeping your mind lower on the body tends to lead to deeper meditation. If you are sleepy, then focus higher, such as at the nostrils.