Final answer:
Stage III plane I of sedation is a stage of deep sleep characterized by low frequency, high amplitude delta waves. It is difficult to awaken someone from this stage of sleep.
Step-by-step explanation:
Stage III plane I of sedation is a stage of anesthesia characterized by deep sleep or slow-wave sleep. During this stage, the brain produces low frequency, high amplitude delta waves. Heart rate and respiration slow dramatically, and it is difficult to awaken someone from sleep during this stage. Individuals who have increased levels of alpha brain wave activity during stage III often report not feeling refreshed upon waking.