Sleep is an altered state of consciousness characterized by decreased responses to stimuli. While some external stimuli may still be perceived during sleep, overall perception is reduced compared to when awake. Sleep is not complete unconsciousness (as indicated in choice A and B) nor is it a complete lack of response to stimuli (as in choice C).

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What Is Sleep

Question 13

Multiple Choice

What is sleep?

A) Sleep is unconsciousness with perception of strong stimuli only.
B) Sleep is unconsciousness with heightened perception of external stimuli.
C) Sleep is a state with no response to stimuli.
D) Sleep is an altered state of consciousness with decreased responses to stimuli.

Correct Answer: