The brain operates on two levels. one of these is the level.

One level is, Awarness
And the second is Unconcious/Subcontious
Hope this is helpfull

The two levels are Awareness and Unconsciousness (consciousness)

Explanation:

A brain is an organ of the central nervous system it functions can be found in all vertebrate and invertebrate animals. located close to the visual senses. Gives signals impulses that act as action potentials that act on distant parts of the body. Unconsciousness is the state when the ability to maintain a sense of the environment and the surroundings is essentially lost involving a complete or near-complete lack of response to stimuli. It may also occur as a result of brain hemorrhage or brain hypoxia, severe fatigue and other cause. Where consciousness i.e the awareness is the quite opposite in which the person operates his present state of mind.