When the serpent beguiled Eve man was born into the world and man was driven out of the garden of eden. Man has Gods Spirit trapped in the animal body. The struggle of man is between the Spirit and the flesh as to which will rule. Emotions keep man from knowing who he is, and that keeps him from becoming sons of God. As you don't put your trust in inspired Scripture I will try to make things logical to you.
Art directors use brain storming to be creative.
When you dwell on what you are trying to create you pound your mind with all you want and know about what you are trying to create. Then you sleep on it. In the morning you have the answers you were seeking. This works, but you go over this all night, and you don't get paid for your work at night. You may have used this same process while studying.