During REM sleep, or rapid eye movement sleep, the brain is highly active and dreams are most likely to occur. Breathing and heart rates may be variable during this stage, and the muscles are usually in a state of paralysis. Brain activity during REM sleep is actually quite high, which is why dreams can be so vivid and memorable.

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During REM Sleep

Question 62

Multiple Choice

During REM sleep,

A) breathing rate and heart rate are low and stable.
B) the muscles are tense and active.
C) brain activity is at a minimum.
D) dreams are most likely to occur.

Correct Answer: