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investigated the participants'sleep quality in the sleep laboratory by recording the electrical activity of the brain. Data comparison revealed that the participants'depth of sleep was equal,regardless of whether they had taken the caffe- ine or the placebo capsules.But they saw a significant difference in the gray matter,depending on whether the subject had re- ceived caffeine or the placebo.After 10 days of placebo,the vol- ume of gray matter was greater than following the same period of time with caffeine capsules."Our results do not necessarily mean that caffeine consumption has a negative impact on the brain.Af- ter just 10 days of coffee abstinence(节制)，it significantly re generated in the participants.The changes in brain structure seem to be temporary,"says a researcher.