After only a few days of limited sleep, caffeine lost its stimulating effect
From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.cbsnews.com%2Fnews%2Fcant-get-your-caffeine-buzz-on-maybe-you-need-more-of-this%2F&key=ddaed8f51db7bb1330a6f6de768a69b8
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