Match the following characteristics to the phases of sleep.
-Majority of sleep spent in this phase
A)Slow-wave
B)Paradoxical

Question

Quizplus · Accepted Answer

Slow-wave sleep (also known as Stage 3 and Stage 4 sleep) is characterized by slow brain waves and is the deepest stage of sleep. The majority of sleep time (about 75%) is spent in this phase.

Answer: B
 Paradoxical sleep (also known as REM sleep) is characterized by rapid eye movements and dreaming. It is called paradoxical because although the brain is very active during this phase, the muscles of the body are relaxed and almost paralyzed. This phase usually occurs about 90 minutes after falling asleep and lasts for about 20-25% of the sleep cycle.

Match the Following Characteristics to the Phases of Sleep