Identical twins have more similar sleep patterns than do fraternal twins,and people in industrialized nations go to bed later at night than their counterparts of a century ago.These facts best illustrate that sleep patterns are affected by both

A) rapid eye movements and sleep spindles.
B) latent content and manifest content.
C) alpha waves and beta waves.
D) heredity and environment.

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Dominic Mattina · Accepted Answer

Final Answer : D, Explanation :  The fact that identical twins have more similar sleep patterns than fraternal twins suggests that genetics plays a role in sleep patterns. On the other hand, the fact that people in industrialized nations go to bed later than their counterparts from a century ago suggests that environmental factors, such as changes in work/life demands and exposure to artificial light, also play a role. Therefore, sleep patterns are affected by both heredity and environment. None of the other options are relevant to the information provided.

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