REM sleep is also known as paradoxical sleep because

• Measures of the brain activity closely resemble waking consciousness, but the person is incapable of moving.
• The person can have night terrors during this stage but will not remember them in the morning. (E) Th e person's vital signs are very slow, but the person can get up and walk around
• Measures of the brain activity closely resemble waking consciousness, but the person is in the deepest stage of sleep.
• The person's heart rate is slower than when awake, but the person can sleepwalk or sleep talk.