Consciousness
The state of being aware of oneself and one's surroundings, without hindrance from sleep, illness, drugs, or hypnotism. This awareness is not purely of external events or phenomena, but also of one's own feelings, beliefs, and mental events.
Such introspective self-awareness, as opposed to merely responding to external stimuli, is generally taken to be a prerequisite for consciousness. This sidesteps the question of animal consciousness, which is largely believed to be very different or even nonexistent.






