Altered states of consciousness

What are some examples of "altered states of consciousness" and how do they differ from normal states?

Waking state: attention directed to surroundings. Includes agitated, restless/"monkey mind" states which are especially amenable to treatment with light and sound stimulation.

"Alpha" state: Relaxed, tranquil, daydreaming, "inward awareness" state. Light meditation here, too.

Hypnagogic, or "twilight" state: Borderline sleep; deep meditation state; hypnotic state; access to the unconscious mind and enhanced retrieval of memories; creativity, accelerated or "superlearning", inspiration. Associated with increased theta brainwave activity

Trance state: Deep, dreamless sleep; deep rest. Often associated with increased delta brainwave activity