This is a human behavior with a long, very interesting history. Chemist August Kekule supposedly was trying to sort out the chemical structure of Benzene, dozed

This is a human behavior with a long, very interesting history. Chemist August Kekule supposedly was trying to sort out the chemical structure of Benzene, dozed off, and dreamt of a snake with his tail in his mouth: http://en.wikipedia.org/wiki/August_Kekul%C3%A9#The_ouroboros_dream http://en.wikipedia.org/wiki/August_Kekul%C3%A9#The_ouroboro... There are many other similar stories of various kinds of technical problems being solved during sleep and/or while dreaming.