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Dawn Marcus, Neurology, answeredSleep experts in Switzerland found that sleep deprivation temporarily worsened people's mental capabilities. When these same sleep-deprived people had caffeine, simple mental processes did improve. Complex mental activities, however, do not improve with caffeine. So don't use caffeine to avoid feeling the need for sleep. Taking the time to get adequate sleep will improve your performance and productivity, making up for the time "lost" by sleeping.