[单选题]
_____.
A .This is called stage 1 sleep.
B .If you are an average sleeper, your sleep cycle is as follows.
C .But instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly.
D .Sleep is very useful for a person’s health.
E .This period of rapid eye movement lasts for some 8-15 minutes and is called REM sleep.
F .The lower your stage of sleep, the slower your brain waves will be.
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