Thinking along the lines of "improving night vision", (sensory inforamtion); I know you can improve your hearing capabilities. I wonder if you can also do this with your vision?

For those of you who, as an example, have small children that you were responsible for at night...think of how you were able to detect that child's smallest sounds...even when you were asleep.

I always thought of it as "hearing between the layers". Your brain learns to isolate the sound it needs to hear even when you are not consciously listening. I realize that a sleeping person will recognize a sound long before their vision would know start detecting anything.

Besides detecting form and movement in the dark; what other ways have any of you sharpened your night vision capabilities?

Do you depend on sounds around you as much as what you are able to see?