States of Consciousness
There are 7 nominal states of consciousness. 3 predominate: awake, asleep, and dreaming. These states reflect basic bodily and mental activity.
While awake, the body is receptive, and often active. The mind is active with perception, as well as with thoughts not immediately based upon sensory input. The typical awake mind maintains several mental streams, but only 1 consciously predominates at any moment.
While asleep, the body is at rest, and not receptive to experience; so too the mind. The sleeping state has the mind-body in repose.
During dreaming, the body remains at rest, but the mind is active in experiences not based upon immediate perception. Instead, the mind engages with memories and other internally generated fabrications. The mind is more open to extra-consciousness communication while dreaming than when awake.
Simultaneity in states of consciousness is common. For instance, daydreaming is dreaming while awake: in both, the mind presents fantasies. State transitions over short durations are also common, as catnapping illustrates.