Question

The deepest stage of sleep is experienced during:

A. stage III.
B. stage VI.
C. stage I.
D. stage IV.

Answer 1

The deepest stage of sleep occurs during NREM stage 3 sleep, which features low frequency, high amplitude delta waves, and slowed heart rate and respiration.

Step-by-step explanation:

The deepest stage of sleep is experienced during NREM stage 3 sleep, often referred to as deep sleep or slow-wave sleep. This stage is characterized by low frequency, high amplitude delta waves. An individual’s heart rate and respiration slow dramatically during this stage, and it is much more difficult to awaken someone from sleep at this time. On the other hand, sleep spindles and K-complexes, which are important for learning and memory, are most often associated with stage 2 sleep.

Therefore, the correct answer to the question 'The deepest stage of sleep is experienced during:' is A. stage III.

Answer 2

The deepest stage of sleep is experienced during stage III sleep, or deep sleep, marked by significant decreases in heart rate and respiration and high amplitude delta waves.

Step-by-step explanation:

The deepest stage of sleep is experienced during stage III, which is known as deep sleep or slow-wave sleep, characterized by low frequency, high amplitude delta waves. This stage of sleep sees a significant decrease in an individual's heart rate and respiration, making it much more difficult to awaken someone. Sleep spindles and K-complexes, however, are most often associated with stage II sleep. These are important for learning and memory and indicate a deeper level of sleep, but not the deepest when compared to stage III.