Definition of a dream

Yesterday late in the night I was watching a program called "人体～セックスと人体機能～" in the discovery channel. The english reading is "Human body ~ Sex and human body function ~". I happened to see yesterday's part from the series. Yesterday's was all about brain's functionality. In that program they defined the meaning of "dream".

It was mentioned
"Dream is nothing but, uncontrolled thinking", and they added great scientists always dreamt solutions to their problems, and this was possible only due to "uncontrolled thinking". It was a very interesting definition, because from time to time, I have dreamt about solution to some complex algorithm related questions that I have come across ...

Can we term a scientist "a day dreamer", why not?

How little we know about the world.
We start at the atomic level, and stop at the milky way galaxy.

We need better microscopes and telescopes eh ...