medium · LSAT Logical Reasoning
A large-scale medical study found that individuals who consume three or more cups of coffee daily reported significantly higher quality of sleep than non-coffee drinkers. This result surprised researchers, given that caffeine is a well-known stimulant that typically interferes with sleep.
Which one of the following, if true, most helps to resolve the researchers' surprise?
- Participants who drank no coffee were more likely to report feeling groggy during the morning hours.
- Many people who drink coffee throughout the day also eat sugary snacks that can cause an energy drop later in the evening.
- Caffeine has a half-life of roughly six hours in the average human body.
- The participants who drank three or more cups of coffee also tended to exercise more vigorously, an activity strongly associated with better sleep.
- The study measured sleep quality through participant self-reports rather than laboratory observation.
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