What "programs" sighted people to sleep at night?A.A decrease in melatonin level.B.An incr

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What "programs" sighted people to sleep at night?

A.A decrease in melatonin level.

B.An increase in melatonin level.

C.Personal habits.

D.Psychological hint.

请帮忙给出正确答案和分析,谢谢!

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