C The fact that the subjects slept 415 minutes per night after drinking decaf.
4. What does the experiment mentioned in paragraph 4 prove?
B There are more melatonin concentrations in caffeine drinkers urine sample.
D Caffeine drinkers produce less sleep hormone.
A coffee lovers sleep less than those who do not drink coffee.
C people sleep more soundly at midnight than at 3 am.
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