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Why Are the Terms Light Sleep and Deep Sleep Not

Question 172

Multiple Choice

Why are the terms light sleep and deep sleep not very useful?​


A) Even sleep that is interrupted repeatedly can be restful.
B) ​REM sleep is deep in some ways and light in others.
C) ​Periods of light sleep often lead into periods of deep sleep.
D) ​Many animal species have little or no REM sleep.

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