Red Bull, failed

I know that coffee, soda, and all the other caffeine drinks have no effect on me, can not wake me up.  And now I know that Red Bull fails to do so too.  I know it because today I drank my first and probably last can of Red Bull because my supervisor gave me a free lunch coupon.  I used the coupon to buy lunch, including a can of Red Bull, at company cafeteria.  It's now 8:22 pm, and I am feeling sleepy, even after drinking that can of Red Bull a while ago.  Red Bull, failed (at least one me.)