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          You may have noticed brighter night skies recently as we experienced a full moon. NASA reports the event, called theWolf Moon, began Thursday afternoon and ended Saturday morning. But did you notice any changes in your personalsleep patterns in the days leading up to the full moon?
          As the latest full moon was beginning, a new study was released suggesting that a full moon can affect human sleepcycles. Researchers confirmed that the nights leading up to a full moon have more natural light available after the sun goesdown. The new research found that in the days before a full moon, people go to sleep later in the evening and sleep forshorter periods of time. The results were reported in a study appearing in the publication Science Advances. The researchwas led by biology professor Horacio de la Iglesia of the University of Washington.“When we looked at the data it wasright there - we didn’t expect that pattern at all,” de la Iglesia said in a video about the findings. He said the study providedclear evidence that a person’s sleep-wake cycle is “synchronized” with changes the moon goes through.
          The moon takes 27.3 days to orbit Earth, but it takes 29.5 days to complete a full cycle from New Moon to NewMoon. The new study measured the sleep patterns of test subjects as the moon progressed through at least one whole29.5-day cycle. Some subjects were tested through two moon cycles. On average, people involved in the study slept about52 minutes less on nights before a full moon. They also went to bed about 30 minutes later. The research showed thatpeople had the latest bedtimes and the shortest amount of sleep during the nights that were three to five days before a fullmoon.“I became one of the subjects of the study and when I looked back on my own data I could not believe how muchmy sleep changed,” de la Iglesia said.
          Past studies by de la Iglesia’s team and other research groups have shown that access to electricity has a clear effecton sleep. So the team included this element in their research. The study involved 98 individuals living in three differentcommunities of Toba indigenous people in Argentina. Each community had different access to electricity. One ruralcommunity had no electricity access, while a second had only limited access. A third community was in a more populatedarea and had full access to electricity.
         Sleep data was collected electronically from the individuals through wrist monitors. The research team said it believesthis method resulted in more effective data than some past studies that depended only on user-reported sleep data. Inaddition to the indigenous communities, the researchers also examined sleep data on 464 college students in the Seattle,Washington area. That data had been collected for a separate study. The researchers said they discovered the same mooncycle patterns in the sleep data from the students.
         “Although the effect is more robust in communities without access to electricity, the effect is present in communitieswith electricity,” de la Iglesia said. The scientists say further research is needed to help explain other possible causes forthe changes in sleep patterns in the test subjects. Such causes could involve biological differences in individuals or socialpatterns within communities.
【題組】46. What was a main finding about sleep patterns of people during a full moon?
(A) People sleep earlier and sleep for shorter periods of time.
(B) People sleep later and usually do not stay asleep at night.
(C) People go to sleep later and sleep for shorter periods of time.
(D) People go to sleep later and sleep for longer periods of time.