Our brains are amazing - all the things that happen without us even thinking about them. Check out the podcasts on Ideas - one talks about our memory and one on sleep. (Beware - these are designed for native speakers!)
Have you heard about the difference between the right and left sides of our brain. The two different sides are supposed to govern different functions.
Left Brain Thinking
Logical Sequential Rational Analytical Objective Looks at parts
Right Brain Thinking
Random Intuitive Holistic Synthesizing Subjective Looks at wholes
Check out the Funderstanding website for more detail on this. Which do you think you identify with? Try out this simple quiz to see which side of the brain you favour. Then answer the quiz in the sidebar.