-This image depicts the sleep cycles over the course of a typical night. In which stage does the brain become much more active,and heart rate, blood pressure, and respirations shift up and down, sometimes extremely?

Question

Quizplus · Accepted Answer

During REM (Rapid Eye Movement) sleep, the brain becomes much more active, and physiological changes such as fluctuations in heart rate, blood pressure, and respiration occur.

-This Image Depicts the Sleep Cycles Over the Course of a Typical