When you think they are not there, they still are but your brain is doing a better job at filtering them out.

The brain has the ability to reallocate resources. At some times, it is using twice the processing power for visual and less for auditory or tactile.

This is why closing your eyes will help increase cognitive processing.

So, stop looking for trouble. You will usually find it.

btw, Closing your eyes is a good way to start to develop quicker "Stop and Think" skills. Later, you can work on those skills with eyes open.