People are mystified by the need for sleep. Why do we turn ourselves off for eight hours out of twenty-four? Some likely answers are to restore the body and mind, and to keep us out of trouble during the dark hours.
LUCID DREAMERS are more aware of their real situation, they know they are dreaming thus we can say they are AWAKE IN THEIR DREAMS.
But how does anyone or anything come to be aware?
The sensory organs detect information (like light, sound, texture etc) in the world and transmit it to the brain. The brain interprets the information and synthesizes it into a conception of what is happening in the outside world.
Our brain maintains an up-to-date model of what's going on in the world and predicts what may happen in the future.
Prediction requires using previously acquired information to go
beyond the information currently available.
The contents of your consciousness,that is, your current experiences, are constructed and depend on your present
purposes, what you are doing and what relevant information is currently available.