The Caffeine in Tea per kilo is higher than Coffee, but we use less to make a cup, so the amount we ingest is lower. Still, too much caffeine will turn your eyes into large misty marbles and take you to far flung washing-up baskets. If you think that sounds mad, try spending the day in your dirty washing. What are you, nuts! Seriously though, this piece is about caffeine and sleep deprivation. It splits out as follows.