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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Definitions:

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