During stage 4 NREM:
A)the sleeper can easily awaken and become alert almost immediately.
B)the sleeper's heart rate, blood pressure, and breathing rate drop to their lowest levels.
C)the sleeper is essentially paralyzed and incapable of movement.
D)sleep spindles occur.

Question

Quizplus · Accepted Answer

During stage 4 NREM, the sleeper's heart rate, blood pressure, and breathing rate drop to their lowest levels. This is often referred to as deep sleep and it can be difficult to awaken an individual in this stage of sleep. This is also the stage where the body can repair and restore itself.

During Stage 4 NREM