Neurobiology is a biological science focused on the study of the nervous system. Basically, we focus on the brain, to which most nerve impulses are directed because it is the brain that is the command center. It receives and sends nerve signals. It seems that our thoughts and feelings are formed in the brain.
When we sleep we spend 1/3 of our lives completely paralyzed and defenceless. The latest theory of defensive activation sheds new light on the role that dreams play.