High internal content, but low external awareness. Deep Sleep: Low arousal and low content.
Before addressing awareness, we must look at the "hardware" that supports it. How the Brain Works: Explaining Consciousness
Philosopher David Chalmers famously split the study of consciousness into two categories: High internal content, but low external awareness
Figuring out how the brain integrates information, regulates sleep, or reacts to stimuli. (Technically difficult, but scientifically solvable). High internal content