What's in your head?

During everyday life, there must always something in our head. It's maybe a music, which is often called BGM. Or it's an article, a poem, or your quarreling with some just a moment ago or very long before.

So why would we brain just to stop and have a rest? Why does it just keep working? This is a mystique which may be known after many many research.

Can we write down what we think while our minds are roaming? The answer maybe not, because these thoughts are by product of mindless thinking.

If, maybe only if, we can write it down, will it be a great master piece. For very talent scientist or musician or writer, it maybe true. Many stories had been told for that kind of things.