Once you can be aware of one sensation, you can begin to expand that ‘field' of attention to include other sensations like sounds, touch, sights, and so on; notice how each of these "sense consciousness" happens of its own accord, they occur when an object makes contact with them and don't require any effort on your part. It's a fascinating thing to do, just noticing how your experience of the world is being constructed in real-time and how incredible the human brain and nervous system are; the ever-changing, chaotic blast of information that makes up "reality" is received, decoded, and interpreted by this organism to create this experience of the world...and "I" am not involved in any way, shape or form. Literally.