48. What does the word both in the third paragraph refer to?
(A)Sleep time and sleep efficiency.
(B)At bedtime and three hours before bed.
(C)Three hours and six hours before bedtime.
(D) Caffeine consumptions and sleep perception.

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統計： A(478), B(172), C(268), D(281), E(0) #1458482

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This last finding is especially important, because it suggests that people can't ______ and shouldn't ______ rely entirely on their own perceptions of how much or little caffeine affects their sleep, especially caffeine consumed in the afternoon.

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