Answer :
Final answer:
Stage 3 of non-rapid-eye-movement sleep is the deep sleep phase characterized by slow breathing and difficulty to wake, driven by delta waves and essential for body restoration.
Explanation:
Stage 3 of non-rapid-eye-movement sleep, also known as slow-wave sleep or delta sleep, is when a person would have slow breathing and be difficult to wake. This stage is characterized by low-frequency, high-amplitude delta waves, dramatically slowed heart rate and respiration. It is crucial for restorative functions like muscle repair, growth, and immune function.
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