What is the biggest difference between the different stages of the sleep cycle?

Question

Quizplus · Accepted Answer

The biggest difference between the different stages of the sleep cycle is in changes in brain-wave activity. The different stages of sleep are characterized by different patterns of brain-wave activity, with rapid eye movement (REM) sleep being associated with high-frequency, low-amplitude waves and non-REM (NREM) sleep being associated with slower, higher-amplitude waves. These changes in brain-wave activity are closely linked to different types of mental processes and physiological functions that occur during sleep. Therefore, tracking the stages of the sleep cycle using brain-wave activity is an important tool for understanding the many functions of sleep.

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