回答（50）题 查看材料A.The delta rhythm will disappear，to

回答（50）题 查看材料

A.The delta rhythm will disappear，to be replaced by the activity pattern of brain waves．

B.If you are an average sleeper，your sleep cycle is as follows．

C.In stage 4 sleep people tend to dream．

D.The lower your stage of sleep，the slower your brain waves will be．

E.This period of rapid eye movement lasts for some 8 to 1 5 minutes and is called REM sleep．

F.This is called stage l sleep．

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