Half the group was allowed to take a nap from 2 p. m. to 3:40 p. m., while the rest stayed awake throughout the day.
一半的参与者被允许在下午2点到3：40睡个午觉，另一半人整天保持清醒。
Half the group was allowed to take a nap from 2 p. m. to 3:40 p. m., while the rest stayed awake throughout the day.
一半的参与者被允许在下午2点到3：40睡个午觉，另一半人整天保持清醒。
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