Caffeine and amino acids

From coffee to tea to Red Bull, it's quite obvious I am not getting enough rest to stay focused throughout the day/night.
I can't wait until the exam is over so I can rest!
Although I am concerned about one drink that can give me 250% of my daily recommended value of Vitamin B6 - I don't want to overload on anything really.

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Life is a delicate balance. One thing may drive you so far up the wall that you're just about to fall off and then comes along another thing that can ease you right back down.