We just learned about Consciousness.
Another part of sleep is Unconsciousness.
When a person is asleep they are usually not moving, with their eyes closed, and they can't talk or do things.
Sometimes a person gets hurt or passes out, and they look like they are asleep, but it's not really the same as being asleep because they can't just be woken up.
If someone is like this and they are still breathing and healthy but they seem asleep that is called being unconscious.
Sleep isn't the same thing as being unconscious because your body and brain are able to wake up if you need to.
(from: wikipedia - unconsciousness)
Kid Facts - Blast from the past: Semicircular Canals
