Tired

Oh my goodness I'm so tired. I had half a cup of coffee this morning, and half a can of pepsi at lunch. The thing about caffeine with me though is that it wakes me up in the morning, and it keeps me from going to sleep at night, but in the middle of the afternoon I feel dead. By 6pm this evening I'll be full of energy again. Why can't I have that energy now, when I need it??? I couldn't care less if I get sleepy AFTER work, but no, it's always in the middle of the afternoon. Ok I HAVE to get to bed by 9:30pm tonight!!!