Exhausted

I am so (insert bad word here) tired. Sorry but someimes you just have to use them. I have just taken my all day active multi-vitamin so hopefully that kicks in soon. I just want to curl up under my desk and go to sleep right now. There is such a lack of focus right now. Because of the early morning I hit my late afternoon exhaustion right after lunch. It's terrible timing. Does anyone have any ideas for getting some energy? Other than coffee or caffeine. Your stumped now aren't you?