Aware of being aware
Awareness of an environment as sufficient communication
Knows of the existence of communication
Communication with the intention to communicate
Communication with significance with somebody else
Communication with significance
Communication with self with significance (worry)
(Even here, some slight awareness that he is thinking a thought and communicating with the thought he is thinking)
Unconsciousness (Absolute unconsciousness is, however, unobtainable)
ACC/ Staff Auditors Conference 4 April 1955 Magazine Articles on Level 0 Checksheet