What is the biggest difference between the different stages of the sleep cycle?
A) Changes in physical activity
B) Changes in brain-wave activity
C) Changes in muscle tone
D) Changes in respiratory effort

Question

Quizplus · Accepted Answer

The biggest difference between the different stages of the sleep cycle is changes in brain-wave activity. The different stages of sleep are defined by distinct patterns of brain-wave activity, including rapid eye movement (REM) and non-REM sleep. These changes in brain-wave activity can be seen on an electroencephalogram (EEG) and are associated with different levels of consciousness, dreaming, and physical relaxation. While there are also changes in physical activity, muscle tone, and respiratory effort during the different stages of sleep, these changes are often secondary to the changes in brain-wave activity.

What Is the Biggest Difference Between the Different Stages of the Sleep